Find the sum of all the stereocenters that are present in the compounds shown below.

The correct energy profile for amine inversion and the hybridization of nitrogen in the transition state is:

The number of possible isomers of butene $(C_4H_8)$ are

Determine the absolute configurations of the labeled carbons ($a$ and $b$).

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.

What is the decreasing order of the inductive effect for the following benzyl/allyl systems (where $R$ is an alkyl group)?