In the presence of peroxide, styrene reacts with $\mathrm{HBr}$ to give $\mathrm{X}$. When $\mathrm{X}$ reacted with magnesium in dry ether followed by ${\mathrm{CO}}_2$ and hydrolysis gave $\mathrm{Y}$. Treatment of $\mathrm{Y}$ with ${\mathrm{PCl}}_5$ and then next with ${\mathrm{H}}_2,\mathrm{Pd}-{\mathrm{BaSO}}_4$ gave $\mathrm{Z}$. What is $\mathrm{Z}$?

The major product of the following reaction is:

In the given reaction, the product $\mathrm{P}$ is

The major product in the following conversion is

What is the major product expected from the following reaction?



Where D is an isotope of hydrogen.

In the following passage there are blanks, each of which has been numbered. There are questions given below the passage and for each question, four words are suggested, one of which fits the blank appropriately. Find out the appropriate word in each case.

Whenever I go into a bank, I feel scared. Everybody and everything that I see there (1) ____ me. As for the manager the sight (2) ____ him simply terrifies me and (3) ____ me want to runaway (4) _____ I can. As soon as I (5) ____ the door of the bank I lose my head (6) ____ when I try to do any (7) ____ there, I behave like an idiot. I cannot explain (8) ____ for this but that is how it (9) ____ has been that is how it is (10) ____.

Select the most appropriate option for blank No. 10.