Which one of the following compounds gives a secondary amine on reduction?

The major products $P$ and $Q$ from the following reactions are:

Explain Gabriel phthalimide synthesis.

Which of the following reagents is used to convert a $-CN$ group to a $-CH_2NH_2$ group?

The major product formed in the following reaction is

Consider the following sequence of reactions:
$PhCOOH$ $\xrightarrow[2. NH_3]{1. PCl_5} A$ $\xrightarrow[2. H_2/Ni]{1. P_4O_{10}, \text{heat}} B.$
The final product $(B)$ is: