To prepare Butane -2-ol from $C H_{3} M g B r,$ the other compound used is

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Propanane

Ethanal

Propanal

Ethanol

answer is B.

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Detailed Solution

When CH₃MgBr reacts with an aldehyde, the Grignard reagent adds to the carbonyl carbon, followed by hydrolysis, resulting in the formation of an alcohol. For butan-2-ol, the target alcohol, the aldehyde used must have three carbon atoms (propanal) so that the addition of the methyl group from CH₃MgBr produces a four-carbon secondary alcohol.

Reaction:

CH₃MgBr + CH₃CH₂CHO → CH₃CH(OH)CH₂CH₃ (butan-2-ol)

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