The Clemmensen reduction of acetone yields

Which of the following aldehydes is less reactive towards nucleophilic addition reaction?

The most appropriate reagent to distinguish between acetaldehyde and formaldehyde is

Which of the following is a hemiacetal?

Which one of the following pairs is not correctly matched?

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 $:$