Grignard reagent reacts with compounds containing which of the following groups?

Which one of the following is produced when acetone is saturated with $HCl$ gas?

Identify the reaction in which the carbonyl group of aldehydes and ketones is reduced to a methylene group upon treatment with zinc-amalgam and concentrated hydrochloric acid.

The major product $(Z)$ of the following chemical reaction is

In the given reaction sequence,the conversion of $B$ to $C$ is known as:

Aldol condensation is a popular and classical method to prepare $\alpha, \beta-$unsaturated carbonyl compounds. This reaction can be both intermolecular and intramolecular. Predict which one of the following is not a product of intramolecular aldol condensation?