Question

Ethylmagnesiumchloride on reacting with cdcl2 gives

Answer 1

$\Large\color{darkblue}\underline{\underline{\sf Answer-}}$

If there are any alcohols on a carbon chain, then the Grignard reagent will react with the hydrogen on the alcohol before it will react with the carbonyl carbon. .The same thing occurs if water is added to the reaction before the Grignard reagent has reacted with the aldehyde/ketone.