Question

Explain two methods of preparations of alkanes​

Answer 1

Method1:Wurtz Reaction

In wourtz reaction a solution of alkyl halide in ether on heating with sodium gives alkane.

R-X + 2Na + X-R \overset{Dry Ether}{\rightarrow} R-R + 2NaX

Method2:By the Reduction of Alkyl Halides

Alkyl halides on reduction with nascent hydrogen form alkanes. R-X + 2[H]→R-H + HX. The nascent hydrogen may be obtained by any one of the following

Zn + HCI

Zn + CH3COOH

Zn-Cu couple in ethanol

Red P + HI

Al-Hg + ethanol