In the chemical reaction $CH_3Cl$ $\xrightarrow{AgCN} (A)$ $\xrightarrow{H_2/Pd} (B)$,what is the structure of $(B)$?

Explain the acylation of ethanamine and aniline.

Match List-$I$ with List-$II$:
Benzenediazonium chloride $(C_6H_5N_2^+Cl^-)$ is reacted with reagents in List-$I$ to form products in List-$II$.
| List-$I$ (Reagent) | List-$II$ (Product) |
| :--- | :--- |
| $A$. Aniline $(C_6H_5NH_2)$ | $I$. Fluorobenzene $(C_6H_5F)$ |
| $B$. $HBF_4, \Delta$ | $II$. Benzonitrile $(C_6H_5CN)$ |
| $C$. $Cu, HCl$ | $III$. $p$-Aminoazobenzene $(C_6H_5-N=N-C_6H_4-NH_2)$ |
| $D$. $CuCN/KCN$ | $IV$. Chlorobenzene $(C_6H_5Cl)$ |
Choose the correct answer from the options given below:

Before nitration of amino benzene,the $-NH_2$ group is first protected by which of the following processes?

Identify the compound from the following having the lowest boiling point.

Explain the physical properties of amine compounds. Explain the basic character (nature) of amine compounds.