Product $(A)$ of the reaction is

The hottest region of the Bunsen flame shown in the figure below is:

Which of the following hydrocarbons has the lowest dipole moment?

$CH_3-CH(CH_3)-CH_3$ $\xrightarrow{KMnO_4} (A)$ $\xrightarrow[\Delta]{H^{+}} (B)$ $\xrightarrow[ROOR]{HBr} (C)$
Product $(C)$ in the above reactions is:

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

The cycloalkane $(X)$ on bromination consumes one mole of bromine per mole of $(X)$ and gives product $(Y)$ in which $C:Br$ ratio is $3:1$. The percentage of bromine in the product $(Y)$ is $ . . . . . . \%$ (Nearest integer).
(Given: Molar mass in $g \ mol^{-1}$, $H:1, C:12, O:16, Br:80$)