A) \[OCOR\]
B) \[O{{C}_{2}}{{H}_{5}}\]
C) \[N{{H}_{2}}\]
D) \[Cl\]
Correct Answer: D
Solution :
\[R-\overset{\begin{smallmatrix} O \\ |\,| \end{smallmatrix}}{\mathop{C}}\,-x+N{{u}^{-}}\xrightarrow{{}}R-\overset{\begin{smallmatrix} O \\ || \end{smallmatrix}}{\mathop{C}}\,-Nu+{{X}^{-}}\] Best leaving group (poorest nucleophile) is \[C{{l}^{-}}\]thus fastest reaction is with\[Cl\].
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