Identify the pair of isomers $A$ and $B$ from the given options.

Find out the statements which are not true.
$A$. Resonating structure with more number of covalent bonds and lesser charge separation are more stable.
$B$. In electromeric effect, an unsaturated system shows $+E$ effect with nucleophile and $-E$ effect with electrophile.
$C$. Inductive effect is responsible for high melting point, boiling point and dipole moment of polar compounds.
$D$. The greater the number of alkyl groups attached to the doubly bonded carbon atoms, higher is the heat of hydrogenation.
$E$. Stability of carbanion increases with the increase in $s$-character of the carbon carrying the negative charge.
Choose the correct answer from the options given below.

Identify the conformer of $2$-methylpentane.

The structure of $E-(S)-1$-chloro-$1$-bromo-$2$-methyl-$2$-hexene is best represented by

In assigning $R-S$ configuration,which among the following groups has the highest priority?

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