How much of JEE Main comes from Organic Compounds with Functional Groups?

JEEGenie estimates about 8% of JEE Main marks come from Organic Compounds with Functional Groups, based on recent papers. The share varies from year to year.

Which formulas matter most in Organic Compounds with Functional Groups?

The Organic Compounds with Functional Groups sheet on this page has 12 formula entries, starting with Oxidation of Alcohols, Lucas Test for Alcohols, Acidity of Phenols, Ethers (R-O-R'), Nucleophilic Addition to Carbonyl. Each one comes with when to use it and the trap to avoid.

What topics does Organic Compounds with Functional Groups cover for JEE?

Organic Compounds with Functional Groups covers Haloalkanes and Haloarenes, Alcohols Phenols and Ethers, Aldehydes and Ketones, Carboxylic Acids, Amines, Nitrogen Compounds.

How should I revise Organic Compounds with Functional Groups before the exam?

Learn each formula together with its condition of use, read the trap listed beside it, then practise questions and review every mistake. The practice link on this page opens Organic Compounds with Functional Groups questions on JEEGenie.

How many previous-year questions are there on Organic Compounds with Functional Groups?

JEEGenie has 1668 previous-year questions on Organic Compounds with Functional Groups, and this page shows a few with worked explanations.

Is practice on Organic Compounds with Functional Groups free on JEEGenie?

Sign-up is free and includes a 7-day Pro trial. After the trial, free accounts keep a limited daily quota.

Organic Compounds with Functional Groups for JEE Main & Advanced — formulas, what is asked, and traps

JEEGenie estimates about 8% of JEE Main marks come from Organic Compounds with Functional Groups. This page covers 12 formula entries, each with when to use it, what JEE asks and the traps. A common slip: Do not confuse functional groups with substituents like alkyl groups; functional groups determine reactivity.

Key points to know

Functional Group. A functional group is an atom or group of atoms within a molecule that is responsible for its characteristic chemical reactions and properties.
IUPAC Nomenclature of Functional Groups. The IUPAC name is built by identifying the parent chain (longest carbon chain containing the principal functional group), numbering to give the functional group the lowest locant, and using prefixes/suffixes.
Alcohols (R-OH). Alcohols have a hydroxyl (-OH) group attached to a saturated carbon. They are classified as primary (1°), secondary (2°), or tertiary (3°) based on the carbon bearing the -OH.
Phenols (Ar-OH). Phenols have a hydroxyl group directly attached to an aromatic ring. They are more acidic than alcohols due to resonance stabilization of the phenoxide ion.
Ethers (R-O-R'). Ethers have an oxygen atom bonded to two alkyl or aryl groups. They are relatively unreactive but can be cleaved by strong acids (HI, HBr).
Aldehydes and Ketones (RCHO, R2C=O). Aldehydes have a carbonyl group (C=O) bonded to at least one hydrogen; ketones have the carbonyl bonded to two carbon groups. They undergo nucleophilic addition reactions.
Carboxylic Acids (RCOOH). Carboxylic acids contain a carboxyl group (-COOH). They are acidic due to resonance stabilization of the carboxylate anion. They form derivatives like esters, amides, and acid chlorides.
Amines (R-NH2, R2NH, R3N). Amines are derivatives of ammonia with one or more alkyl/aryl groups. They are basic due to the lone pair on nitrogen. Primary (1°), secondary (2°), and tertiary (3°) amines exist.
Nitro Compounds (R-NO2). Nitro compounds have a nitro group (-NO2) attached to carbon. They are important as intermediates in synthesis and can be reduced to amines.
Haloalkanes and Haloarenes (R-X, Ar-X). Haloalkanes have a halogen attached to an sp3 carbon; haloarenes have halogen attached to an aromatic ring. Haloalkanes undergo nucleophilic substitution (SN1/SN2) and elimination; haloarenes are less reactive.
Grignard Reagent (R-MgX). Grignard reagents are organomagnesium compounds (RMgX) that act as strong nucleophiles and bases. They react with carbonyl compounds, CO2, and other electrophiles.
Aromatic Electrophilic Substitution. Aromatic rings undergo electrophilic substitution (e.g., nitration, halogenation, sulfonation, Friedel-Crafts) where an electrophile replaces a hydrogen atom. The ring's substituents affect reactivity and orientation.
Diazonium Salts (Ar-N2+X-). Diazonium salts are formed by diazotization of primary aromatic amines with NaNO2/HCl at 0-5°C. They are versatile intermediates for substitution reactions (replacement of -N2+ by -Cl, -Br, -I, -CN, -OH, etc.) and coupling reactions.

Formula sheet

Name	Formula	When to use
Oxidation of Alcohols	$\begin{array}{r} R C H_{2} O H \overset{[O]}{\to} R C H O \overset{[O]}{\to} R C O O H \\ R_{2} C H O H \overset{[O]}{\to} R_{2} C = O \\ R_{3} C O H \overset{[O]}{\to} No reaction \end{array}$	Use when predicting products of alcohol oxidation reactions in JEE.
Lucas Test for Alcohols	$R O H + H C l \overset{Z n C l_{2}}{\to} R C l + H_{2} O$	Use to distinguish between primary, secondary, and tertiary alcohols in lab-based JEE problems.
Acidity of Phenols	$C_{6} H_{5} O H ⇌ C_{6} H_{5} O^{-} + H^{+} p K_{a} \approx 10$	Use to predict the relative acidity of different phenols in JEE questions.
Ethers (R-O-R')	$R - O - R^{'} + H I \to R O H + R I (or R^{'} I + R O H)$	Use when predicting cleavage products of ethers or comparing physical properties.
Nucleophilic Addition to Carbonyl	$R_{2} C = O + N u^{-} \to R_{2} C (N u) O^{-} \overset{H^{+}}{\to} R_{2} C (N u) O H$	Use to predict products of addition reactions to aldehydes/ketones.
Tollens' Test for Aldehydes	$R C H O + 2 [A g (N H_{3})_{2}]^{+} + 3 O H^{-} \to R C O O^{-} + 2 A g ↓ + 4 N H_{3} + 2 H_{2} O$	Use to distinguish between aldehydes and ketones in JEE practical problems.
Esterification Reaction	$R C O O H + R^{'} O H ⇌ R C O O R^{'} + H_{2} O$	Use to predict the product of esterification or to design a synthesis of an ester.
Hinsberg Test for Amines	$\begin{array}{r} R N H_{2} + C_{6} H_{5} S O_{2} C l \to C_{6} H_{5} S O_{2} N H R \overset{N a O H}{\to} soluble \\ R_{2} N H + C_{6} H_{5} S O_{2} C l \to C_{6} H_{5} S O_{2} N R_{2} (insoluble) \end{array}$	Use to distinguish between primary, secondary, and tertiary amines in JEE practical problems.
Reduction of Nitro Compounds	$R N O_{2} + 6 [H] \to R N H_{2} + 2 H_{2} O$	Use to predict the product of reduction of nitro compounds.
SN1 vs SN2 Reactions	$\begin{array}{r} S N 2 : N u^{-} + R - X \to R - N u + X^{-} (inversion) \\ S N 1 : R - X \to R^{+} + X^{-}; R^{+} + N u^{-} \to R - N u (racemization) \end{array}$	Use to predict the product and stereochemistry of nucleophilic substitution reactions.
Reaction of Grignard with Carbonyl	$\begin{array}{r} R M g X + H C H O \to R C H_{2} O H (primary) \\ R M g X + R^{'} C H O \to R^{'} C H (O H) R (secondary) \\ R M g X + R_{2}^{'} C = O \to R_{2}^{'} C (O H) R (tertiary) \end{array}$	Use to predict the alcohol formed from a Grignard reaction.
Sandmeyer Reaction	$\begin{array}{r} A r N_{2}^{+} C l^{-} \overset{C u C l}{\to} A r C l + N_{2} \\ A r N_{2}^{+} B r^{-} \overset{C u B r}{\to} A r B r + N_{2} \\ A r N_{2}^{+} C l^{-} \overset{C u C N}{\to} A r C N + N_{2} \end{array}$	Use to predict the product when a diazonium salt is treated with copper(I) halide.

Open the Organic Compounds with Functional Groups formula page

What JEE asks

Functional Group. JEE often asks to identify the functional group from a given structure or to predict the product of a reaction based on the functional group.
IUPAC Nomenclature of Functional Groups. JEE frequently tests naming of compounds with two or more functional groups, especially those with -OH and -CHO or -COOH.
Alcohols (R-OH). JEE often tests the Lucas test for distinguishing 1°, 2°, 3° alcohols and the oxidation of alcohols to aldehydes/ketones/carboxylic acids.
Oxidation of Alcohols. JEE often asks to identify the product when a given alcohol is treated with CrO3/H2SO4 or KMnO4.
Lucas Test for Alcohols. JEE often presents a scenario with three alcohols and asks which gives immediate turbidity with Lucas reagent.
Phenols (Ar-OH). JEE frequently tests the acidity order of substituted phenols (e.g., p-nitrophenol > phenol > p-cresol).
Acidity of Phenols. JEE often asks to arrange given phenols in increasing order of acidity or to identify the strongest acid among substituted phenols.
Ethers (R-O-R'). JEE often tests the cleavage of ethers with HI, especially the product distribution in unsymmetrical ethers.
Aldehydes and Ketones (RCHO, R2C=O). JEE often tests the distinction between aldehydes and ketones using Tollens' or Fehling's test.
Nucleophilic Addition to Carbonyl. JEE often asks for the product of a Grignard reaction with a carbonyl compound or the formation of cyanohydrins.
Tollens' Test for Aldehydes. JEE often asks which compound gives a silver mirror with Tollens' reagent.
Carboxylic Acids (RCOOH). JEE often tests the order of acidity of substituted benzoic acids or the reaction of carboxylic acids with PCl5 or SOCl2.
Esterification Reaction. JEE often asks to identify the ester formed from a given acid and alcohol or to propose a mechanism.
Amines (R-NH2, R2NH, R3N). JEE often tests the order of basicity of amines (e.g., in gas phase vs aqueous solution) and the Hinsberg test.
Hinsberg Test for Amines. JEE often asks to identify the type of amine based on its behavior with Hinsberg reagent.
Nitro Compounds (R-NO2). JEE often tests the reduction of nitrobenzene to aniline or the effect of -NO2 on acidity of phenols.
Reduction of Nitro Compounds. JEE often asks for the product when nitrobenzene is reduced with Sn/HCl.
Haloalkanes and Haloarenes (R-X, Ar-X). JEE often tests the mechanism (SN1 vs SN2) based on substrate structure and the reactivity of aryl halides.
SN1 vs SN2 Reactions. JEE often asks to identify whether a given alkyl halide will undergo SN1 or SN2 and to predict the product.
Grignard Reagent (R-MgX). JEE often tests the reaction of Grignard reagents with aldehydes/ketones to form alcohols or with CO2 to form carboxylic acids.
Reaction of Grignard with Carbonyl. JEE often asks to identify the carbonyl compound needed to synthesize a given alcohol using a Grignard reagent.
Aromatic Electrophilic Substitution. JEE often asks to predict the major product of nitration or bromination of a given aromatic compound.
Identifying Major Product in EAS. JEE often asks to identify the major product when a compound like p-nitrotoluene is nitrated.
Diazonium Salts (Ar-N2+X-). JEE often tests the conversion of aniline to various substituted benzenes via diazonium intermediates (Sandmeyer reaction).
Sandmeyer Reaction. JEE often asks to identify the product of Sandmeyer reaction starting from aniline.

Common traps

Do not confuse functional groups with substituents like alkyl groups; functional groups determine reactivity. Functional Group
For multiple functional groups, priority order: -COOH > -SO3H > -COOR > -COX > -CONH2 > -CN > -CHO > -CO- > -OH > -NH2 > -OR > -X > -NO2. IUPAC Nomenclature of Functional Groups
Phenol (C6H5OH) is not an alcohol; it is a different class due to aromatic ring conjugation. Alcohols (R-OH)
Using strong oxidants like KMnO4/H+ on primary alcohols directly gives carboxylic acids, not aldehydes. Oxidation of Alcohols
The test works only for alcohols soluble in the reagent (typically up to 6 carbons). Lucas Test for Alcohols
Phenols do not undergo nucleophilic substitution easily; they require special conditions. Phenols (Ar-OH)
Do not compare pKa values directly without considering substituent effects; ortho-substituents also have steric effects. Acidity of Phenols
With HI, the smaller/primary alkyl group usually gives the alkyl iodide (SN2); if one group is tertiary the tertiary iodide forms (SN1); in aryl alkyl ethers the aryl C–O bond is never cleaved, so the products are phenol and the alkyl iodide. Ethers (R-O-R')
Aldehydes are more reactive than ketones towards nucleophilic addition due to less steric hindrance and greater electrophilicity of the carbonyl carbon. Aldehydes and Ketones (RCHO, R2C=O)
Grignard reagents (RMgX) add to carbonyls but are destroyed by protic solvents; use dry ether. Nucleophilic Addition to Carbonyl
The reagent must be freshly prepared; stored/old reagent can deposit explosive silver nitride (fulminating silver, $A g_{3} N$ ), so discard it after use. Tollens' Test for Aldehydes
The -COOH group is a combination of carbonyl and hydroxyl; it has unique properties. Carboxylic Acids (RCOOH)
The alcohol oxygen is retained in the ester; use 18O labeling to confirm. Esterification Reaction
Aromatic amines (e.g., aniline) are weaker bases than aliphatic amines due to resonance delocalization of the lone pair. Amines (R-NH2, R2NH, R3N)

Topics in Organic Compounds with Functional Groups

Haloalkanes and Haloarenes
Alcohols Phenols and Ethers
Aldehydes and Ketones
Carboxylic Acids
Amines
Nitrogen Compounds

Previous-year questions on Organic Compounds with Functional Groups

JEEGenie has 1668 previous-year questions on Organic Compounds with Functional Groups. A few worked examples follow.

Year	Questions
2026	110
2025	87
2024	126
2023	127
2022	121
2021	166
2020	77
2019	158
2018	48
2017	49
2016	35
2015	28
2014	39
2013	51
2012	26
2011	8
2010	12
2009	9
2008	16
2007	10
2006	27
2005	16
2004	19
2003	24
2002	14
2001	11
2000	18
1999	13
1998	25
1997	16
1996	11
1995	10
1994	12
1993	10
1992	17
1991	9
1990	8
1989	4
1988	8
1987	7
1986	14
1985	18
1984	13
1983	17
1982	7
1981	10
1980	4
1979	3

Question 1 easy

Complete combustion of

X

g of an organic compound gave

0.25

g of

C O_{2}

and

0.12

g of

H_{2} O

. If the % of carbon is

25 %

and of hydrogen is

4.89 %

, then

X = \underline{} \times 10^{- 3}

g. (Nearest integer) (Molar mass of C, H and O are 12, 1 and 16 g mol

^{- 1}

respectively.)

273
27
2730
227

Answer: A

Explanation. 1. Mass of carbon in

0.25

g of

C O_{2}

Mass of C = \frac{12}{44} \times 0.25 = 0.06818 g

2. Given carbon percentage in the compound is

25 %

, so:

0.25 \times X = 0.06818

3. Solve for

X

X = \frac{0.06818}{0.25} = 0.27272 g

4. Express in required form:

X = 0.27272 g = 272.72 \times 10^{- 3} g

5. Nearest integer:

X \approx 273

273

**Answer: A) 273**

From NTA/IIT papers: JEE Main 2026 · 2 Apr Shift 2

Question 2 medium

An optically active alkyl halide

C_{4} H_{9} B r [A]

reacts with hot KOH dissolved in ethanol and forms alkene

[B]

as major product which reacts with bromine to give dibromide

[C]

. The compound [C] is converted into a gas [D] upon reacting with alcoholic

{N a N H}_{2}

. During hydration 18 gram of water is added to 1 mole of gas [D] on warming with mercuric sulphate and dilute acid at 333 K to form compound [E]. The IUPAC name of compound [ E ] is :

Butan-2-ol
But-2-yne
Butan-2-one
Butan-1-al

Answer: C

Explanation.

C_{4} H_{9} B r

[A] is optically active, so it is 2-bromobutane. Reaction with hot alcoholic KOH gives but-2-ene [B] (major, Saytzeff). [B] +

{B r}_{2}

gives 2,3-dibromobutane [C]. [C] + alcoholic

{N a N H}_{2}

undergoes double dehydrohalogenation to give but-2-yne [D]. Hydration of but-2-yne with

{H g S O}_{4}

H_{2} {S O}_{4}

at 333 K adds water (18 g/mol) to give butan-2-one [E] via enol–keto tautomerism. Thus, [E] is butan-2-one. Answer: option C

From NTA/IIT papers: JEE Main 2025 · 2 Apr Shift 1

Question 3 hard

Consider the following reaction. 4-bromobenzyl alcohol (para-bromo substituted benzyl alcohol)

\to_{{Br}_{2}}^{red phosphorous}

R (major product). On estimation of bromine in 1.00 g of R using Carius method, the amount of AgBr formed (in g) is ______. [Given: Atomic mass of H = 1, C = 12, O = 16, P = 31, Br = 80, Ag = 108]

Answer: 1.50

Explanation. 4-Bromobenzyl alcohol has the structure

{BrC}_{6} H_{4} {CH}_{2} OH .

With red phosphorus and bromine, the benzylic alcohol is converted to the benzylic bromide:

{BrC}_{6} H_{4} {CH}_{2} OH \overset{{P/Br}_{2}}{\to} {BrC}_{6} H_{4} {CH}_{2} Br .

So the major product R is 4-bromobenzyl bromide:

C_{7} H_{6} {Br}_{2} .

Molar mass of R:

7 (12) + 6 (1) + 2 (80) = 84 + 6 + 160 = 250 {g mol}^{- 1} .

In 1.00 g of R, moles of R:

\frac{1.00}{250} = 0.004 mol .

Each molecule of R has 2 bromine atoms, so moles of Br:

0.004 \times 2 = 0.008 mol .

In Carius method, all bromine is converted to AgBr. Molar mass of AgBr:

108 + 80 = 188 {g mol}^{- 1} .

Mass of AgBr formed:

0.008 \times 188 = 1.504 g \approx 1.50 g .

1.50

From NTA/IIT papers: JEE Advanced 2022

Frequently asked questions

How much of JEE Main comes from Organic Compounds with Functional Groups?: JEEGenie estimates about 8% of JEE Main marks come from Organic Compounds with Functional Groups, based on recent papers. The share varies from year to year.
Which formulas matter most in Organic Compounds with Functional Groups?: The Organic Compounds with Functional Groups sheet on this page has 12 formula entries, starting with Oxidation of Alcohols, Lucas Test for Alcohols, Acidity of Phenols, Ethers (R-O-R'), Nucleophilic Addition to Carbonyl. Each one comes with when to use it and the trap to avoid.
What topics does Organic Compounds with Functional Groups cover for JEE?: Organic Compounds with Functional Groups covers Haloalkanes and Haloarenes, Alcohols Phenols and Ethers, Aldehydes and Ketones, Carboxylic Acids, Amines, Nitrogen Compounds.
How should I revise Organic Compounds with Functional Groups before the exam?: Learn each formula together with its condition of use, read the trap listed beside it, then practise questions and review every mistake. The practice link on this page opens Organic Compounds with Functional Groups questions on JEEGenie.
How many previous-year questions are there on Organic Compounds with Functional Groups?: JEEGenie has 1668 previous-year questions on Organic Compounds with Functional Groups, and this page shows a few with worked explanations.
Is practice on Organic Compounds with Functional Groups free on JEEGenie?: Sign-up is free and includes a 7-day Pro trial. After the trial, free accounts keep a limited daily quota.