When $HNO_3$ is reacted with $ . . . . . . $,chloropicrin is formed.

Predict the product of the following reaction:
(Image: $A$ chiral carbon attached to a phenyl ring with a para-chloro group,a deuterium atom $(D)$,a hydrogen atom $(H)$,and a chlorine atom (Cl) in a specific stereochemical configuration. The reaction is with $NaI$ in acetone.)

In the given reaction sequence,$(X)$ and $(Y)$ are:

Which of the following will give a white precipitate with $AgNO_3$?

The maximum number of $RBr$ isomers producing $2-$methylbutane by the given sequence of reactions is $...........$ $(Consider the structural isomers only)$

Which of the following,when undergoing addition of $HBr$,will form $ONLY$ a pair of diastereomers?