What is the octane number fuel contains $\text{25\%}\text{n-heptane}$ and $\text{75\%}\text{iso-octane}$?

Which hydrogen in compound $\left(E\right)$ is easily replaceable during bromination reaction in presence of light ?

The total number of monohalogenated organic products in the following (including stereoisomers) reaction is

$$\begin{gathered} \underset{(\mathrm{Simplest} \mathrm{optically} \\ \mathrm{active} \mathrm{alkene})}{\mathrm{A}} \underset{\left(\mathrm{ii}\right) {\mathrm{X}}_2/∆}{\overset{\left(\mathrm{i}\right) {\mathrm{H}}_2/\mathrm{Ni}/∆}{\to }} \end{gathered}$$

Identify the decreasing order of boiling point of alkanes

(i) $\mathrm{n}$-pentane

(ii) Isopentane

(iii) Neopentane

Which of the following is a free radical substitution reaction?

Isomers of hexane, based on their branching, can be divided into three distinct classes as shown in the figure.

The correct order of their boiling point is