In the given reaction,$[X]$ will be:

The structure of the major product formed in the following reaction is

Identify the products formed and comment on the optical activity of the products for the following reaction: $3$-phenylcyclopent-$2$-en-$1$-one + $H_2$ $(2-3 \ atm)$ $\xrightarrow{10\% Pd/C, \text{Ethanol}}$ ?

Identify the major product formed from the following reaction sequence:

Consider the following sequence of reactions:
Nitrobenzene $\xrightarrow[(ii) NaNO_2, HCl, 0^{\circ}C]{(i) Sn + HCl} \text{Benzenediazonium chloride}$ $\xrightarrow{(iii) Cu_2Cl_2} \text{Chlorobenzene}$ $\xrightarrow{(iv) Na, \text{Ether}} A$
Molar mass of the product formed $(A)$ is $.............. \ g \ mol^{-1}$.

How many $(\sigma)$ and $(\pi)$ bonds are present in the structure of $DDT$ respectively?