A racemic mixture of `2-` Chloropropanoic acid is treated with excess of `(+)-2-` Butanol. The reaction can be represented as follows `:`
`CH_(2)-underset((pm))underset(Cl)underset(|)(CH)-COOH+CH_(3)-underset(" "(+)" excess")underset(OH)underset(|)(CH)-CH_(2)-CH_(3) rarr CH_(3)-underset(Cl)underset(|)(CH)-COO-overset(" "CH_(3))overset(|)(CH)-CH_(2)-CH_(3)+CH_(3)-underset((+)" (Left unreacted)")underset(OH)underset(|)(CH)-CH_(2)-CH_(3)`

Options

A. only one optically pure ester is obtained
B. A mixture of two ester ( enantiomers ) is obtained
C. A mixture of four stereoisomers of ester is obtained
D. All esters formed are optically active

Answer

4

Explanation

Esters formed have two different chiral central, so they are optically active.