Which of the following is not obtained when propyl chloride and methyl chloride react with sodium in dry ether?

Methyl chloride and n-propyl chloride undergo a Wurtz reaction. ${\mathrm{CH}}_3-\mathrm{Cl} + {\mathrm{C}}_3{\mathrm{H}}_7- \mathrm{Cl} + 2 \mathrm{Na}\stackrel{\mathrm{dry} \mathrm{ether}}{\to }{\mathrm{CH}}_3-{\mathrm{CH}}_3 + {\mathrm{C}}_3{\mathrm{H}}_7-{\mathrm{C}}_3{\mathrm{H}}_7 + {\mathrm{CH}}_3-{\mathrm{C}}_3{\mathrm{H}}_7$Hence , the correct option (B)$C_4{H}_{10}$.