Reaction of ethyl chloride with sodium leads to

Give the general formula of an alkyl group.

What is the number of tertiary carbon atoms in a molecule of isobutane?

Which of the following will give two isomeric monochloro derivatives?

Identify the product obtained in the following reaction:
$n CH_3 MgI + n H_2 O \xrightarrow{\text{dry ether}} \text{product}$

$R^{\prime}-X \xrightarrow{Na / \text{ether}} 2,3-\text{dimethylbutane}$. Identify $R^{\prime}$.