The reagents $A$ and $B$ in the above reaction are:

How many bond cleavages are required to convert cubane into a non-cyclic skeleton?

Classify hydrocarbon compounds and provide examples.

Which one of the following alkenes will react fastest with $H_2$ under catalytic hydrogenation condition?

What are $X$ and $Y$ respectively in the following sets of reactions?
$I. \ CH_3CH_2CH_2OH \xrightarrow{PBr_3} X$
$II. \ CH_3CH=CH_2 \xrightarrow{HBr, (C_6H_5COO)_2} Y \text{ (major)}$

Match the four starting materials $(P, Q, R, S)$ given in List-$I$ with the corresponding reaction schemes $(I, II, III, IV)$ provided in List-$II$ and select the correct answer using the code given below the lists. Codes: $P \quad Q \quad R \quad S$