What does the molecular formula $C_3H_9N$ represent?

Match List-$I$ with List-$II$:

List-$I$	List-$II$
$A$. Benzenesulphonyl chloride	$I$. Test for primary amines
$B$. Hoffmann bromamide reaction	$II$. Anti Saytzeff
$C$. Carbylamine reaction	$III$. Hinsberg reagent
$D$. Hoffmann orientation	$IV$. Known reaction of isocyanates

Choose the correct answer from the options given below.

Given below are two statements:
Statement $I$: The dipole moment of $R-CN$ is greater than $R-NC$ and $R-NC$ can undergo hydrolysis under acidic medium to produce $R-NH_2$ and $HCOOH$.
Statement $II$: $R-CN$ hydrolyses under acidic medium to produce a compound which on treatment with $SOCl_2$ followed by the addition of $NH_3$ gives another compound $(x)$. This compound $(x)$ on treatment with $NaOCl/NaOH$ gives a product,that on treatment with $CHCl_3/KOH/\Delta$ produces $R-NC$.
In the light of the above statements,choose the correct answer from the options given below:

$A$ student has planned to prepare acetanilide from aniline using acetic anhydride. The student has started from $9.3 \ g$ of aniline. However,the student has managed to obtain $11 \ g$ of dry acetanilide. The $\%$ yield of this reaction is $.....$ (in $\%$)

$C_3H_9N$ represents

Match the following:

List-$I$ (Amine)	List-$II$ ($pK_b$ value)
$A$. $N,N$-Dimethylaniline	$I$. $9.30$
$B$. Aniline	$II$. $8.92$
$C$. $N$-Ethylethanamine	$III$. $9.38$
$D$. $N$-Methylaniline	$IV$. $3.00$

The correct answer is