Aniline does not undergo

$(A)$ $\xrightarrow[(1) \text{ excess } CH_3I/K_2CO_3, (2) \text{ } Ag_2O/H_2O, (3) \text{ } \Delta]{} (B)$ $\xrightarrow[(i) \text{ excess } CH_3I/K_2CO_3, (ii) \text{ } Ag_2O, (iii) \text{ } \Delta]{} H_2C=CH-CH(CH_3)-CH=CH_2$. Identify $(A)$.

Which of the following will be the most stable diazonium salt $(R-N_2{^+} X^{-})$?

The final product $C$ in the following series of reactions is:

Which of the following statements is $NOT$ correct?

The correct order of basic strength of the following amines is