What is formed when nitrobenzene is reduced using zinc and alkali?

Starting from propanoic acid,the following reactions were carried out: $CH_3-CH_2-COOH$ $\xrightarrow{SOCl_2} X$ $\xrightarrow{NH_3} Y$ $\xrightarrow{Br_2 + KOH} Z$. What is the compound $Z$?

Write the physical properties of $C_6H_5N_2Cl$ (benzenediazonium chloride).

Consider the following sequence of reactions. The percentage of nitrogen in the yellow product $(X)$ formed is . . . . . . %. (Nearest Integer) (Given Molar mass in g mol$^{-1}$ $H$:$1$, $C$:$12$, $N$:$14$)

Which of the following groups increases the basic strength of substituted aniline?

In the reaction,$P, Q$ and $R$ respectively are: