Maximum carbon-carbon bond distance is found in

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

Given below are two statements:
Statement $I$ : The boiling point of three isomeric pentanes follows the order
$n$-pentane $>$ isopentane $>$ neopentane
Statement $II$ : When branching increases,the molecule attains a shape of sphere. This results in smaller surface area for contact,due to which the intermolecular forces between the spherical molecules are weak,thereby lowering the boiling point.
In the light of the above statements,choose the most appropriate answer from the options given below:

When $methyl \ bromide$ is heated with $Zn$,it gives:

Which of the following gases has the highest heat of combustion?

Bromination of alkanes involves: