$Propanone$ and $propanal$ are:

Which of the following will exhibit tautomerism?

Which of the following compounds possesses both a plane of symmetry $(POS)$ and a centre of symmetry $(COS)$?

The compounds $(I)$ $HOOC-CH(OH)-CH(Br)-COOCH_3$ and $(II)$ $CH_3OOC-CH(Br)-CH(OH)-COOH$ are related as:

Which of the following methods of structural formula representation conventionally uses a point for the front carbon and a circle around it for the rear carbon?

The number of possible isomers for ${C_7}{H_8}O$ is ......