Which type of isomerism is exhibited by the following compounds $I$ and $II$?
$(i)$ $CH_3CH=CHCH_3$
$(ii)$ $CH_3-CH(OH)-CH_2CH_3$

Which one of the following molecules does not show stereoisomerism?

What is the relationship between the two structures shown?

$A$ pair of stereoisomers might be classified in various ways. Which of the following statements are true with respect to pairs of stereoisomers?
$a$. They might be configurational isomers
$b$. They might be diastereomers
$c$. They might be constitutional isomers
$d$. They might be tautomers
$e$. They might be conformational isomers
$f$. They might be enantiomers
$g$. They might be positional isomers

How many isomers (cyclic and acyclic) are possible for a compound with molecular formula $C_3H_6O$?

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