Through `S_(N)2` reaction we cannot convert
A. `CH_(3) -CH_(2) -CI " into " CH_(3) CH_(2) - CN`
B. `CH_(3) - underset(CH_(3))underset(|)(CH) - Br ` into
`CH_(3) -underset(CH_(3))underset(|)(CH) -O -overset(CH_(3))overset(|)underset(CH_(3))underset(|)(C ) -CH_(3)`
C. `CH_(3) -undersert(CH_(3))underset(|)(CH) -Br` into
`CH_(3) -underset(CH_(3))underset(|)(CH ) - O - overset(O) overset(||)(C ) - CH_(3)`
D.
