What is the order of basicity for the following compounds?

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:

Which of the following is more basic than aniline?

Identify the correct decreasing order of basic strength of methyl-substituted amines in an aqueous solution.

The correct order of base strength in benzene as a solvent for the given amines is:
$I: CH_3CH_2NH_2$
$II: (CH_3CH_2)_2NH$
$III: (CH_3CH_2)_3N$

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