The hydrolysis of alkyl isocyanides $(R-CH_2-NC)$ gives:

The following sequence of reaction on $A$ gives:

The reaction sequence is given as follows:
$CH_3-CO-CH_2-CH_2-CO-CH_3$ $\xrightarrow[(NH_4)_2CO_3]{\Delta} (A)$ $\xrightarrow[CCl_3CO_2Na]{\Delta} (B)$
Product $(B)$ of the above reaction is:

Ethyl amine on heating with $CS_2$ in presence of $HgCl_2$ forms

Find the correct order of acidity of the following compounds:
$(I)$ $C_6H_5NH_2$
$(II)$ $C_6H_5CONH_2$
$(III)$ Phthalimide
$(IV)$ $CH_3CH_2NH_2$

The correct order of basicities of the following compounds is:
$1. CH_3-C(=NH)NH_2$ (Acetamidine)
$2. (CH_3)_2NH$ (Dimethylamine)
$3. CH_3-CH_2-NH_2$ (Ethylamine)
$4. CH_3-CONH_2$ (Acetamide)