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The halogen that best delocalizes the el...

The halogen that best delocalizes the electron density to the benzene ring is

A

F

B

Cl

C

Br

D

I

Text Solution

Verified by Experts

The correct Answer is:
A
The smaller the size of the halogen, shorter is the C-X bond. Shorter bonds have more effective overlap of p-orbiitals, (extended `pi`-bonding) and therefore more extensive delocalisation.
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Assertion (A) Presence of a nitro group at ortho or para position increases the reactivity of haloarenas towards nucleophilic substitution. Reason (R ) Nitro group, being an electron withdrawing group decreases the electron density over the benzene ring.

Assertion: Presence of a nitro group at ortho or para position increases the reactivity of haloarenes towards nucleophilic substitution. Reason: Nitro group, being an electron withdrawing group decreases the electron density over the benzene ring.

The decreasing order of electron density on the ring is:

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