Which of the following reagent(s) will convert n-propyl bromide to alkane with same number of carbon atoms?
\[
\text{I. } Zn/H^+
\]
\[
\text{II. } Na/\text{dry ether}
\]
\[
\text{III. } (i)\;alc.KOH \quad (ii)\;H_2/Pt
\]
Show Hint
Wurtz reaction always increases the carbon chain length because two alkyl halide molecules combine together.