What is the effect of halogen on reactivity of benzene ring and what is the reason for decreasing reactivity?
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Answer / parvathi
halogens are electron donatiog, then they decrease its
reactivity.
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Answer / ramakrishna s
Reactivity decreases. Electrophilic substitution decreases at
meta,Because electron density decreases. Nucleophilic
substitution decreases at ortho and para positions
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Answer / pullaih naidu kamisetti
The order of reactivity among Halogens from the more reactive (least deactivating substituent) to the least reactive (most deactivating substituent) halogen is:
F> Cl > Br > I
The order of reactivity of the benzene rings toward the electrophilic substitution when it is substituted with a halogen groups, follows the order of electronegativity. The ring that is substituted with the most electronegative halogen is the most reactive ring ( less deactivating substituent ) and the ring that is substituted with the least electronegatvie halogen is the least reactive ring ( more deactivating substituent ), when we compare rings with halogen substituents. Also the size of the halogen effects the reactivity of the benzene ring that the halogen is attached to. As the size of the halogen increase, the reactivity of the ring decreases.
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