Aldehydes or ketones when treated with $C_6{H}_5-NH-N{H}_2,$ the product formed is

The major products of the following reaction are :

The major product of the following reaction is :

The major product in the following reaction is :

cannot be prepared by:

Here, $\mathrm{Z}$ is:

Consider the reactions:

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

The major product 'X' formed in the following reaction is:

In the following reaction sequence, structures of $\mathrm{A}$ and $\mathrm{B}$ are, respectively

KI in acetone, undergoes S_N2 reaction with each of P, Q, R and S. The rates of the reaction vary as