Which of the following compounds can be best prepared by Wurtz-reaction?

Which of the following is an example of an alkane?

Write the chemical reactions for the preparation of ethane from the following compounds:
$(i)$ Bromo-methane
$(ii)$ Propanoic acid

Which of the following reactions produce an alkane as the product?

In the alkane $CH_3-CH_2-C(CH_3)_2-CH_2-CH(CH_3)_2$,identify $1^{\circ}$,$2^{\circ}$,and $3^{\circ}$ carbon atoms and give the number of $H$ atoms bonded to each one of these.

Assertion $(A)$: Cyclohexane is the most stable cycloalkane.
Reason $(R)$: Cyclopropane and cyclobutane are less stable due to angle strain and torsional strain.
The correct answer is