$A$ compound gives a positive test with $I_2/NaOH$ and is extracted from benzene by $NaHSO_3$. It may be:

What is the final product of this reaction?

Which of the following reagents can be used to reduce the $ > C = O$ group to $CH_2$?

Compound $(X)$ undergoes the following sequence of reactions to give the Lactone $(Y)$. Identify $(X)$.

$CH_3CHO$ reacts with aqueous $NaOH$ solution to form

An organic compound $(X)$ with molecular formula $C_3H_6O$ is not readily oxidised. On reduction it gives $(C_3H_8O)$ $(Y)$ which reacts with $HBr$ to give a bromide $(Z)$ which is converted to a Grignard reagent. This Grignard reagent on reaction with $(X)$ followed by hydrolysis gives $2,3-$dimethylbutan$-2-$ol. Compounds $(X)$,$(Y)$ and $(Z)$ respectively are $:$