Question

How is propanic acid synthesised from ethyl bromide?

Answer 1

Here is the solution....

Answer 2

ether
CH3-CH2-Br +Mg-------------> CH3-CH2-MgBr

CO2(s).
CH3-CH2-MgBr --------> CH3-CH2-CO2^- +MgBr^+
H3O^+
CH3-CH2-CO2^- +MgBr^+ ----------->CH3-CH2-COOH