Which pair never represents $X$ and $Y$ in the following reaction?
Reaction: $X \xrightarrow{Y} CHCl_3 + Z$

An optically active compound $C_6H_{12}O$ gives a positive test with $2,4-$dinitrophenylhydrazine,but a negative test with Tollens' reagent. What is the structure of the compound?

Give applications of cyanohydrins with acetaldehyde with suitable reactions. $OR$ Give following conversions by using acetaldehyde as starting material.
$(a)$ Lactic acid and acrylic acid
$(b)$ Alanine
$(c)$ $1$-amino propane-$2$-ol

Aldehydes can be oxidised by

In the following reaction, the major product $(H)$ is

The total number of $sp^2$ hybridised carbon atoms in the major product $P$ (a non-heterocyclic compound) of the following reaction is. . . . . . .