Compare the rate of catalytic hydrogenation using $H_2 / Pt$ for the following compounds $(a)$ and $(b)$:

The product of the following hydrogenation reaction is:
$C_6H_6 + H_2 \xrightarrow{\text{Catalyst, High temperature and pressure}} ?$
Given: $1 \text{ eqv. of } C_6H_6$ and $1 \text{ eqv. of } H_2$.

Which of the following is among the major products of the reaction of $(E)-3$-methylpent$-2$-ene with $BH_3$ in $THF$ followed by the addition of $H_2O_2/HO^{-}$?

Arrange the following compounds in decreasing order of acidic character of $C-H$ bonds.
$CH_2=CH_2, CH_3-CH_3, C_6H_6, CH\equiv CH$

Product of which of the following reactions is a racemic mixture?

Write chemical equations for the combustion reaction of the following hydrocarbons:
$(i)$ Butane $(ii)$ Pentene $(iii)$ Hexyne $(iv)$ Toluene