JEE Main 2022 · 26 Jun · Shift 2 · Chemistry Q76

← JEE Main 2022 · 26 Jun · Shift 2

ChemistrySingle correct+4 / -1Question 76 of 90

The final product 'A' in the following reaction sequence
$\mathrm{CH_3CH_2\text{-}\overset{\displaystyle O}{\overset{\|}{C}}\text{-}CH_3\xrightarrow{HCN}?\xrightarrow[\text{Heat}]{95\%\ H_2SO_4}A}$
is

\mathrm{CH_3\text{-}CH{=}C(CH_3)\text{-}COOH}

\mathrm{CH_3\text{-}CH{=}C(CH_3)\text{-}CN}

\mathrm{CH_3\text{-}CH_2\text{-}C(OH)(CH_3)\text{-}COOH}

\mathrm{CH_3\text{-}CH{=}C(CH_3)\text{-}CONH_2}

Answer and worked solution

Official answer: A

Cyanohydrin. $\mathrm{CH_3CH_2C(OH)(CH_3)CN}$ .

95% $\mathrm{H_2SO_4}$ , heat. Hydrolysis of CN to COOH and dehydration of the tertiary alcohol: $\mathrm{CH_3CH{=}C(CH_3)COOH}$ , 2-methylbut-2-enoic acid.

(A)

Topics:Nucleophilic addition Carboxylic acids

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JEE Main 2022 · 26 Jun · Shift 2, Chemistry question 76