The enol form of acetone, after treatment with ${\mathrm{D}}_2\mathrm{O}$ gives

cannot be prepared by:

Consider the reactions:

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Identify $\mathrm{A},\mathrm{ }\mathrm{X},\mathrm{ }\mathrm{Y}$ and $\mathrm{Z}$.

In the following reactions, products $\mathrm{A}$ and $\mathrm{B}$ are:

The major product obtained in the following reaction is:

The major product of the following reaction is:

Represent the union of two sets by Venn diagram for each of the following.

$X=\{x | x$ is a prime number between $80$ and $100\}$

$Y=\{y | y$ is an odd number between $90$ and $100\}$