Solution:
Solution
.
The general reaction between ether and CO is
$$R-O-R + CO \xrightarrow[150°C]{BF_3,\ 500\ atm} R-CO-O-R$$
By that logic, the given reaction should yield
$$C_2H_5-O-C_2H_5 + CO \xrightarrow[150°C]{BF_3,\ 500\ atm} C_2H_5CO-O-C_2H_5$$ i.e. Ethyl propionate.
