The most strained cycloalkane is

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

Given below are two statements:
Statement $I$: Methane can be prepared by decarboxylation of sodium ethanoate,Kolbe's electrolysis of sodium acetate and reaction of $CH_3MgBr$ with water.
Statement $II$: Methane cannot be prepared from unsaturated hydrocarbons and by Wurtz reaction.
In the light of the above statements,choose the correct answer from the options given below.

When a certain alkane is mixed with chlorine and irradiated with ultraviolet light,only one monochloroalkane is formed. This alkane is likely to be:

An alkyl bromide $(X)$ reacts with $Na$ in the presence of dry ether to form $4, 5-$diethyloctane. Compound $(X)$ is

Which of the following statements is true?