The number of isomers of $C_4H_{10}$ is:

For which of the following parameters would the structural isomers $C_2H_5OH$ and $CH_3OCH_3$ be expected to have the same values? (Assume ideal behavior)

The compounds $CH_3COCH_3$ and $CH_2=C(OH)CH_3$ exhibit which of the following?

The compound which shows metamerism is:

The number of possible isomers for the molecular formula $C_4H_8$ is .................. .

Tautomerism is exhibited by