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JEE Main levelSingle correct optionDifficulty 2 of 3hx082

$CH X_{3} CH X_{2} MgBr$ reacts with ethylene oxide (oxirane), and the product is hydrolysed with $H X_{3} O X^{+}$ . The product is

A2-methylpropan-1-ol
Bbutan-2-ol
Cpropan-1-ol
Dbutan-1-ol

Answer: D

The carbanion opens the strained epoxide ring by attacking a ring carbon, giving

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

. Hydrolysis gives the primary alcohol with two more carbons than the Grignard alkyl group:

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

.

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