The correct relationship between molecules $I$ and $II$ is:

Match the following:

$A$. Acetaldehyde,vinyl alcohol	$1$. Enantiomers
$B$. Eclipsed and staggered ethane	$2$. Tautomers
$C$. $(+)2$-butanol,$(-)2$-butanol	$3$. Chain isomers
$D$. Methyl-$n$-propylamine and diethylamine	$4$. Conformational isomers
	$5$. Metamers

Which of the following options is the correct order of relative stabilities of cations $I$,$II$,and $III$ as shown below (most stable first)?
$(I) \, C_6H_5CH_2^+$
$(II) \, CH_2=CH-CH_2-CH^+-CH_3$
$(III) \, (CH_3)_3C^+$

Which of the following has $2$ chiral carbon atoms?

Which is an incorrect statement?

Choose the statement that best describes the given compounds.