Wurtz reaction with bromoethane and bromomethane gives a mixture of alkanes. How can you obtain propane as the only product from the same mixture? Give the equations only.
a) (2CH₃Br + 2Na arrow C₃H₈ + 2NaBr)
b) (2CH₃CH₂Br + 2Na arrow C₃H₈ + 2NaBr)
c) (CH₃Br + Na arrow CH₄ + NaBr)
d) (2CH₃CH₂Br + 4Na arrow C₃H₈ + 4NaBr)