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Which of the ...

Question

Which of the following will have the highest reactivity towards $S_{n} A r$ i.e. Nucleophilic Aromatic Substitution reaciton?

A

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B

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C

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D

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Solution

The correct option is A
Fluoride accelerates the ntermediate formation step by its enormous inductive effect. It is the most electronegative element of all and it stabilises the anionic intermediate,
assisting the acceptance of electrons by the benzene ring

Elimination step:
So,(a) will have the highest reactivity towards $S_{N} A r$
The order is :

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Other Reductions

Standard XII Chemistry

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