Question

# Why is the wurtz reaction not preferred for the preparation of alkanes containing an odd number of carbon atoms? Illustrate your answer by taking one example.

For example: $1$- chloroethane and $1$- chloropropane react with Na in the presence of dry ether. It gives butane, hexane, pentane.
$\mathop {C{H_3}C{H_2}Cl}\limits_{\left( {Chloropropane} \right)} + Na + Cl - \mathop {C{H_2}C{H_2}C{H_3}}\limits_{\left( {Chloropropane} \right)} \xrightarrow{{dry{\text{ }}ether}}\mathop {{\text{C}}{{\text{H}}_3}C{H_2}C{H_3}}\limits_{\left( {Bu\tan e} \right)} + \mathop {C{H_3}C{H_2}C{H_2}C{H_2}C{H_3}}\limits_{\left( {Pen\tan e} \right)} + \mathop {C{H_3}C{H_2}C{H_2}C{H_2}C{H_2}C{H_3}}\limits_{\left( {hexane} \right)} \\ mixtures{\text{ }}of{\text{ }}alkane \\$