JEE Main 2022 · 28 Jun · Shift 2 · Chemistry Q75

← JEE Main 2022 · 28 Jun · Shift 2

ChemistrySingle correct+4 / -1Question 75 of 90

$\mathrm{A\xrightarrow[(ii)\ CN^-\ (iii)\ H_2O/H^+]{(i)\ Cl_2,\ \Delta}4\text{-Bromophenyl acetic acid.}}$

In the above reaction 'A' is

Reaction: A treated with (i) Cl2, Δ (ii) CN⁻ (iii) H2O/H⁺ gives 4-bromophenyl acetic acid.

1-Bromo-4-ethylbenzene

Benzene ring with Br and, para to it, CH2CH3.

Bromobenzene

4-Bromotoluene

Benzene ring with Br and, para to it, CH3.

4-Bromostyrene

Benzene ring with Br and, para to it, CH=CH2.

Answer and worked solution

Official answer: C

Working back. $\mathrm{ArCH_2COOH}$ comes from $\mathrm{ArCH_2CN}$ , from $\mathrm{ArCH_2Cl}$ , made by side-chain chlorination of $\mathrm{ArCH_3}$ : A is 4-bromotoluene.

(C)

Topics:Aromatic hydrocarbons and electrophilic substitution Cyanides and isocyanides

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JEE Main 2022 · 28 Jun · Shift 2, Chemistry question 75