Identify the product $A$ in the following reaction:
$C_6H_{11}CH_2Br \xrightarrow{Na, \text{Dry ether}} A$

The alkane which is next to methane in the homologous series can be prepared from which of the following reactions?
$I$. $2 CH_3 Br \xrightarrow[\text{dry ether}]{Na}$
$II$. $CH_3 COOH \xrightarrow[CaO, \Delta]{NaOH}$
$III$. $CH_3 CH=CH_2 \xrightarrow{H_2 / Pt}$
$IV$. $CH_3 CH_2 Br \xrightarrow[H^{+}]{Zn}$
Correct answer is

Octane number has $0$ value for

In commercial gasolines,the type of hydrocarbons which are more desirable is

What is the final product obtained by the reduction of glycerol with hydriodic acid $(HI)$?

$A$ hydrocarbon of molecular mass $72 \ g \ mol^{-1}$ gives a single monochloro derivative and two dichloro derivatives on photochlorination. Give the structure of the hydrocarbon.