In the enolization of the given molecule,the $H$-atom involved is

Which of the following biphenyls is optically active?

The correct statement$(s)$ concerning the structures $E, F$ and $G$ is (are):
$E$: $CH_3CH_2CH(CH_3)COCH_3$
$F$: $CH_3CH_2C(OH)=C(CH_3)_2$ (enol form)
$G$: $CH_3CH_2C(CH_3)=C(OH)CH_3$ (enol form)
$(A)$ $E, F$ and $G$ are resonance structures
$(B)$ $E, F$ and $E, G$ are tautomers
$(C)$ $F$ and $G$ are geometrical isomers
$(D)$ $F$ and $G$ are diastereomers

The compound $C_{4}H_{10}O$ can show which of the following types of isomerism?

Which among the following is $NOT$ a pair of isomers?

Which of the following is an aromatic compound?