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CH_{3}Br+Nu^{-}\rightarrow CH_{3}-Nu+Br^{-}

The decreasing order of the rate of the above reaction with nucleophiles (Nu^{-})A\; to D\; is\; \left [ Nu^{-}=(A)\; PhO^{-},(B)\; AcO^{-},(C)\; HO^{-},(D)\; CH_{3}O^{-} \right ]

  • Option 1)

    D > C > A > B

  • Option 2)

    D > C > B > A

  • Option 3)

    A > B > C > D

  • Option 4)

    B > D > C > A

 

Answers (2)

best_answer

As we learnt,

 

Stability of Carbanions due to resonance -

More the no of resonating structure, more is the stability.

- wherein

 

 Acetate ion (AcO-) is the most stable ion among the given options so it will give the reaction with least rate.

Phenoxide ion (PhO-) is second most stable hence it will also give the SN2 reaction at very low rate but greater than AcO- .

CH3O- ion has -CH3 group which is an activating group (+I) .CH3O- ion will give SN2 reaction with highest rate among the other given ions. So, the sequence is D > C > A > B.

 

 


Option 1)

D > C > A > B

Option 2)

D > C > B > A

Option 3)

A > B > C > D

Option 4)

B > D > C > A

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