Compare the stabilities of the following two compounds :
$A$ : cis-$1$-Ethyl-$3$-methylcyclohexane
$B$ : trans-$1$-Ethyl-$3$-methylcyclohexane

How many cyclic isomers are possible for ${C_5}{H_{10}}$?

Which of the following pairs represents metamerism?

The number of structural isomers of ${C_4}{H_{10}}O$ is:

Among the given structures,which can exhibit tautomerism?

Identify the pairs of compounds which are functional group isomers.
$I$. $CH_3-CH_2-CH_2-CH_2-OH$
$II$. $CH_3-CH_2-CH(OH)-CH_3$
$III$. $(CH_3)_3C-OH$
$IV$. $CH_3-CH(CH_3)-CH_2-OH$
$V$. $CH_3-CH_2-O-CH_2-CH_3$
$VI$. $CH_3-O-CH_2-CH_2-CH_3$
$VII$. $CH_3-O-CH(CH_3)_2$