The electrophile,$E^{\oplus}$ attacks the benzene ring to generate the intermediate $\sigma-$complex. Of the following,which $\sigma-$complex is of the lowest energy?

Which of the given statement(s) about $N$, $O$, $P$ and $Q$ with respect to $M$ is (are) correct?
$(A)$ $M$ and $N$ are non-mirror image stereoisomers
$(B)$ $M$ and $O$ are identical
$(C)$ $M$ and $P$ are enantiomers
$(D)$ $M$ and $Q$ are identical

The reaction $\text{spiro[3.3]hept-1-ene} \xrightarrow{H^+, \Delta} A$. The product $A$ is:

Identify the conformer of $2$-methylpentane.

According to $CIP$ sequence rule,the correct arrangement in order of decreasing priority is :-

The following molecule is fluorometholone,a steroidal anti-inflammatory agent. How many stereogenic centers does it contain?