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How can we prepare RR’ R” OH by the action of excess of a suitable Grignard reagent on which of the following reactants?

How can we prepare RR’ R” OH by the action of excess of a suitable Grignard reagent on which of the following reactants? Correct Answer nitrile or an aldehyde

Preparation of 3o alcohol from ketone and ester by the action of excess of a suitable Grignard reagent is carried out as shown below:

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