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JEE Main levelSingle correct optionDifficulty 2 of 3hx173

$CH X_{3} CH X_{2} MgBr$ reacts with ethylene oxide (oxirane) in dry ether and the adduct is hydrolysed with dilute acid. The product is

Apropan-1-ol
Bbutan-2-ol
Cbutan-1-ol
D2-methylpropan-1-ol

Answer: C

The nucleophilic ethyl group opens the epoxide at a ring carbon, giving

CH X_{3} CH X_{2} CH X_{2} CH X_{2} OMgBr

. Hydrolysis gives

CH X_{3} CH X_{2} CH X_{2} CH X_{2} OH

, a primary alcohol with two more carbons than the Grignard reagent.

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