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To synthesize 1.0 mole of 2-methylpropan-2-ol from Ethylethanoate ______ equivalents of CH3MgBr reagent will be required. (Integer value)

1. 1
2. 2
3. 3
4. 4

Correct answer: 2

Solution

CH3COOC2H5 reacts with CH3MgBr: the first equivalent gives a ketone (acetone) and the second adds to it, giving (CH3)3COH = 2-methylpropan-2-ol. Thus 2 equivalents of CH3MgBr are required.

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