Which of the following group(s) when attached to a benzene ring decreases the electron density at ortho/para positions?

- N R_{2}

No worries! We‘ve got your back. Try BYJU‘S free classes today!

- C O N H_{2}

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

- N O_{2}

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

- C H O

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Open in App

Solution

The correct option is D $- C H O$
$- M$ groups are also called deactivating groups because they decrease the electron density on the benzene ring.
$- M$ group decreases electron density at ortho/para positions.
$- C O N H_{2}$ , $- N O_{2}$ and $- C H O$ shows $- M$ effect whereas $- N R_{2}$ shows $+ M$ effect.
So, $(b), (c) a n d (d)$ are the correct options.

Suggest Corrections

Similar questions

Q. The group which is predominantly ortho/para directing when attached to a benzene ring is :

Assertion (A): - $N O_{2}$ group is benzene ring deactivating and m - directing group

Reason (R): - $N O_{2}$ group with draws electron density from benzene ring and makes ortho and para positions more electron deficient than meta position

Q. A group which deactivates the benzene ring towards electrophilic substitution but directs the reaction at ortho and para position:

Q. A group which deactivates the benzene ring towards EAS but which direct the incoming group principally to the ortho and para position is:

Q. Assertion :The second substituent may enter the mono-substituted benzene ring at either ortho, para or at meta position. Reason: The position of the incoming group is determined by the nature of the group present in monosubstituted benzene ring.

Join BYJU'S Learning Program

Explore more

-R Effect

Standard XII Chemistry

Join BYJU'S Learning Program