Q. The reaction, O O $\ \ \ \ \ \ \ \ \ \parallel \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \parallel$ $R - C - X + Nu^{-} \longrightarrow R - C - Nu + X^{-}$ is fastest when X is
A) OCOR
B) $OC_{2}H_{5}$
C) $NH_{2}$
D) Cl
Explanation
(d)
$\ \ \ \ \ \ \ \ \ O\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ O$
$\parallel \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \parallel$
$R - C - X + Nu^{-} \longrightarrow R - C - Nu^{-} + X^{-}$
Best leaving group (poorest nucleophile) is $Cl^{\oplus}$, thus fastest reaction is with Cl.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.