JEE Main Chemistry question

Isobutyl magnesium bromide, with dry ether and absolute alcohol, gives:

(A)[a primary alcohol and a Grignard reagent, incorrectly paired]
(B)[a pentane-type hydrocarbon and , incorrectly paired]
(C)[an alkane and alkene mixture, incorrectly paired]
(D)isobutane, , and ethoxymagnesium bromide, Correct

Answer: (D)

Solution

Absolute (anhydrous) ethanol provides an acidic proton that the strongly basic Grignard reagent abstracts immediately, in a simple acid–base reaction: (CH_3)_2CHCH_2MgBr + C_2H_5OH \xrightarrow{ether} (CH_3)_2CHCH_3 + C_2H_5OMgBr. The isobutyl group is

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Question ID VK-148158