Identify the correct stability order of the following alkenes:
$I) (CH_3)_2C=C(CH_3)_2$
$II) (CH_3)_2C=CH_2$
$III) (CH_3)_2C=CHCH_3$

Which of the following alkenes cannot be prepared by the deamination of $n-butylamine$ $(n-BuNH_2)$ with $NaNO_2/HCl$?

When glycerol is heated with concentrated sulfuric acid,a substance with a pungent smell is obtained. Which of the following is that compound?

The correct statement$(s)$ for the following addition reactions is(are):
$(i)$ $trans-but-2-ene \xrightarrow{Br_2/CHCl_3} M \text{ and } N$
(ii) $cis-but-2-ene \xrightarrow{Br_2/CHCl_3} O \text{ and } P$
[$A$] ($M$ and $O$) and ($N$ and $P$) are two pairs of diastereomers
[$B$] Bromination proceeds through trans-addition in both the reactions
[$C$] $O$ and $P$ are identical molecules
[$D$] ($M$ and $O$) and ($N$ and $P$) are two pairs of enantiomers

The product of the following reaction is:

$CH_2=CHCl$ reacts with $HCl$ to form