JEE Main · 2024 · 29 Jan 2024 · Shift 1 · Hydrocarbons

Identify product A and product B :

(A)A: (see structure), B: (see structure)
A
B
(B)A: (see structure), B: (see structure)
A
B
(C)A: (see structure), B: (see structure)
A
B
(D)A: (see structure), B: (see structure)
A
B
✓ Correct

Answer: (D)

Solution

Chlorine reacts with the given alkene-bearing aromatic compound differently depending on conditions:

Under photochemical conditions (

Cl_{2} / h ν

), the reaction proceeds by a free-radical mechanism, giving the substitution product A.

In

CCl_{4}

(dark, ionic conditions),

Cl_{2}

adds across the

C = C

double bond by electrophilic addition, giving the vicinal dichloride product B.

The pair (A, B) formed by these two distinct mechanisms corresponds to option D.

Key confirmed: D.

JEE Main · 2024 · 29 Jan 2024 · Shift 1 · Single correct option

Practise more: all JEE Main PYQs on Hydrocarbons →

More JEE Main questions on Hydrocarbons

Identify A in the following reaction.
JEE Main 2026View solution →
Given below are two statements :

Statement I : Benzene is nitrated to give nitrobenzene, which on further treatment with
$CH_{3} COCl / AlCl_{3}$ will give
JEE Main 2026View solution →
As compared with chlorocyclohexane, which of the following statements correctly apply to chlorobenzene?
A. The magnitude of negative charge is more on chlorine atoms
B. The $C - Cl$ bond has partial double bond character
C. $C - Cl$ bond is les …
JEE Main 2026View solution →
The cycloalkane ( X ) on bromination consumes one mole of bromine per mole of ( X ) and gives the product ( Y ) in which $C : Br$ ratio is $3 : 1$ . The percentage of bromine in the product $(Y)$ is
____ %. (Nearest integer)
(Given : Molar mass …
JEE Main 2026View solution →
The dibromo compound [P] (molecular formula: $C_{9} H_{10} Br_{2}$ ) when heated with excess sodamide followed by treatment with dilute HCl gives [Q]. On warming [Q] with mercuric sulphate and dilute sulphuric acid yield [R] which gives positive Iodoform t …
JEE Main 2026View solution →
But-2-yne and hydrogen (one mole each) are separately treated with (i) $Pd / C$ and (ii) $Na /$ liq. $NH_{3}$ to give the products X and Y respectively.

Identify the incorrect statements.
A. $X$ and $Y$ are stereoisomers.
B. Dipole moment of X …
JEE Main 2026View solution →