Hydrocarbons

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JEE Main 2025

LEVELJEE Advanced

The correct reaction/reaction sequence that would produce a dicarboxylic acid as the major product is

(A)

HO-CH2-CH2-Cl -> (i) NaCN, (ii) HO-, H2O, (iii) H3O+

(B)

CHO-(CHOH)4-CH2OH -> Br2, H2O

(C)

Bromocyclohexane -> (i) KOH, EtOH, (ii) KMnO4, H2SO4, \Delta

(D)

Ketone-alcohol -> H2CrO4

JEE Advanced 2026

LEVELJEE Advanced

Treatment of buta-1,3-diyne with $NaNH_{2}$ (2 equivalents), followed by reaction with excess of trans- $CH_{3} -CH=CH-CH_{2} -Br$ gives $X$ as the major product. The maximum number of carbon atoms that are collinear (in a straight line) in $X$ is ____.

JEE Advanced 2022

LEVELJEE Advanced

The number of isomeric tetraenes (NOT containing sp-hybridized carbon atoms) that can be formed from the following reaction sequence is ________.

JEE Advanced 2015

LEVELJEE Advanced

The major product U in the following reactions is :

In the following reaction, the major product is -

The number of -CH2- (methylene) groups in the product formed from the following reaction sequence is ________.

JEE Advanced 2021

LEVELJEE Advanced

Comprehension Passage

For the following reaction scheme, percentage yields are given along the arrow :

x g

and

y g

are mass of

R

and

U

, respectively. (Use : Molar mass (in

g mol^{- 1}

) of

H

C

and

O

1

12

and

16

, respectively)

Question 1:

CH_{3} MgBr

(excess) in

(C_{2} H_{5})_{2} O

followed by addition of

H_{2} O

gives Q. The compound Q on treatment with

H_{2} SO_{4}

0^{\circ} C

gives R. The reaction of R with

CH_{3} COCl

in the presence of anhydrous

AlCl_{3}

CH_{2} Cl_{2}

followed by treatment with

H_{2} O

produces compounds S. [Et it compounds P is ethyl group]

Question 1:

The reactions, Q to R and S to S, are -

(A)

Dehydration and Friedel-Crafts acylation

(B)

Friedel-Crafts alkylation, dehydration and Friedel-Crafts acylation

(C)

Aromatic sulfonation and Friedel-Crafts acylation

(D)

Friedel-Crafts alkylation and Fridel-Crafts acylation

Question 2:

The product S is -

Among the following reaction(s) which gives (give) tert-butyl benzene as the major product is(are)

* Multiple Correct Options

Total number of hydroxyl groups present in a molecule of the major product P is ______.

JEE Advanced 2020

LEVELJEE Advanced

Consider the following transformations of a compound P. Choose the correct option(s).

* Multiple Correct Options

(A)

P is

(B)

X is Pd-C/quinoline/H

_{2}

Which of the following reactions produce(s) propane as a major product?

* Multiple Correct Options

The total number of chiral molecules formed from one molecule of P on complete ozonolysis (O $_{3}$ , Zn/H $_{2}$ O) is ________.

JEE Advanced 2021

LEVELJEE Main

The major product formed in the following reaction is

The reaction of 4-methyloct-ene (P, 2.52 g) with HBr in the presence of (C $_{6}$ H $_{5}$ CO) $_{2}$ O $_{2}$ gives two isomeric bromides in a 9 : 1 ratio, with combined yield of 50%. Of these, the entire amount of the primary alkyl bromide was reacted with an appropriate amount of diethylamine followed by treatment with eq. K $_{2}$ CO $_{3}$ to given a non-ionic product S in 100% yield. The mass (in mg) of S obtained is _____. [Use molar mass (in g mol $^{- 1}$ ) : H = 1, C = 12, N = 14, Br = 80]

JEE Advanced 2014

LEVELJEE Main

Isomers of hexane, based on their branching, can be divided into three distinct classes as shown in the figure. The correct order of their boiling point is

Staggered and eclipsed conformers of ethane are

Alkyl halides react with dialkyl copper reagents to give

Benzene on nitration gives nitrobenzene in presence of $HNO_{3}$ and $H_{2} SO_{4}$ mixture, where

(A)

both

H_{2} SO_{4}

and

HNO_{3}

act as a bases

(B)

HNO_{3}

acts as an acid and

H_{2} SO_{4}

acts as a base

(C)

both

H_{2} SO_{4}

and

HNO_{3}

act as an acids

(D)

HNO_{3}

acts as a base and

H_{2} SO_{4}

acts as an acid

JEE Main 2019

LEVELJEE Advanced

The major product of the following reaction is

When neopentyl alcohol is heated with an acid, it slowly converted into an 85 : 15 mixture of alkenes A and B, respectively. What are these alkenes?

The correct sequence of reagents used in the preparation of 4-bromo-2-nitroethyl benzene from benzene is

(A)

CH_{3} COCl / AlCl_{3}, Br_{2} / AlBr_{3}, HNO_{3} / H_{2} SO_{4}, Zn/HCl

(B)

CH_{3} COCl / AlCl_{3}, Zn-Hg/HCl, Br_{2} / AlBr_{3}, HNO_{3} / H_{2} SO_{4}

(C)

Br_{2} / AlBr_{3}, CH_{3} COCl / AlCl_{3}, HNO_{3} / H_{2} SO_{4}, Zn/HCl

(D)

HNO_{3} / H_{2} SO_{4}, Br_{2} / AlCl_{3}, CH_{3} COCl / AlCl_{3}, Zn-Hg/HCl

JEE Main 2019

LEVELJEE Main

The increasing order of the reactivity of the following compounds towards electrophilic aromatic substitution reaction is

Consider the following reactions, $A A g_{2} O Δ ppt$ $A H g^{2 +} / H^{+} B N a B H_{4} C Z n C l_{2} Conc. HCl Turbidity within 5 minutes$ $A$ is

(A)

C H \equiv C H

(B)

C H_{3} - C \equiv C - C H_{3}

(C)

C H_{3} - C \equiv C H

(D)

C H_{2} = C H_{2}

The correct reaction/reaction sequence that would produce a dicarboxylic acid as the major product is

The number of isomeric tetraenes (NOT containing sp-hybridized carbon atoms) that can be formed from the following reaction sequence is ________.

The major product U in the following reactions is :

In the following reaction, the major product is -

The number of -CH2- (methylene) groups in the product formed from the following reaction sequence is ________.

Comprehension Passage

The value of x is______.

The value of y is______.

The correct statement(s) for the following addition reactions is(are)

Comprehension Passage

The reactions, Q to R and S to S, are -

The product S is -

Among the following reaction(s) which gives (give) tert-butyl benzene as the major product is(are)

Total number of hydroxyl groups present in a molecule of the major product P is ______.

Consider the following transformations of a compound P. Choose the correct option(s).

Which of the following reactions produce(s) propane as a major product?

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } The total number of chiral molecules formed from one molecule of P on complete ozonolysis (O3​, Zn/H2​O) is ________.

The major product formed in the following reaction is

Isomers of hexane, based on their branching, can be divided into three distinct classes as shown in the figure. The correct order of their boiling point is

Staggered and eclipsed conformers of ethane are

Alkyl halides react with dialkyl copper reagents to give

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Benzene on nitration gives nitrobenzene in presence of HNO3​ and H2​SO4​ mixture, where

The major product of the following reaction is

When neopentyl alcohol is heated with an acid, it slowly converted into an 85 : 15 mixture of alkenes A and B, respectively. What are these alkenes?

The correct sequence of reagents used in the preparation of 4-bromo-2-nitroethyl benzene from benzene is

The increasing order of the reactivity of the following compounds towards electrophilic aromatic substitution reaction is

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Consider the following reactions, AAg2​OΔ​ppt AHg2+/H+​BNaBH4​​CZnCl2​Conc. HCl​Turbidity within 5 minutes A is

The total number of chiral molecules formed from one molecule of P on complete ozonolysis (O $_{3}$ , Zn/H $_{2}$ O) is ________.

Benzene on nitration gives nitrobenzene in presence of $HNO_{3}$ and $H_{2} SO_{4}$ mixture, where

Consider the following reactions, $A A g_{2} O Δ ppt$ $A H g^{2 +} / H^{+} B N a B H_{4} C Z n C l_{2} Conc. HCl Turbidity within 5 minutes$ $A$ is