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

Which of the following molecules is (are) chiral?

Which one of the following is most reactive towards electrophilic reagent?

Consider the sets $I$,$II$,and $III$. Identify the set$(s)$ which is (are) correctly matched.
$I$. $\text{Staggered ethane} > \text{eclipsed ethane} \dots \dots \dots \text{torsional strain}$.
$II$. $2, 2-\text{Dimethylbutane} > 2-\text{methylpentane} \dots \dots \dots \text{boiling point}$.
$III$. $cis-\text{but}-2-\text{ene} > trans-\text{but}-2-\text{ene} \dots \dots \dots \text{dipole moment}$.

Which of the following molecules has a plane of symmetry?

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