Chemistry · Hydrocarbons
Work through this past-paper style MCQ, then read the full explanation. Practice more chemistry questions on mMCQ with adaptive practice and topic analytics.
Which one of the following is NOT a meta directing group?
- A
COOH
- B
SO3H
- C
CHO
- D
OH
Meta-directing groups are the electron-withdrawing groups. The attack of the incoming group is at the meta position. OH is ortho and para directing group.This is also the electron donating group and the attack of the incoming group is at the ortho and para position. COOH group is an electron withdrawing group which deactivates the ring. Hence it is a meta directing group. SO3H is an electron withdrawing group, hence, it deactivates the ring because it decreases the electron density of the benzene ring. It is meta-directing group. The aldehyde group (-CHO) in benzaldehyde is a meta-director as it is an electron-withdrawing in nature
This is meta directing group. So this option is Incorrect
This is meta directing group. So this option is Incorrect
This is meta directing group. So this option is Incorrect
Meta-directing groups are the electron-withdrawing groups. The attack of the incoming group is at the meta position. OH is ortho and para directing group.This is also the electron donating group and the attack of the incoming group is at the ortho and para position. COOH group is an electron withdrawing group which deactivates the ring. Hence it is a meta directing group. SO3H is an electron withdrawing group, hence, it deactivates the ring because it decreases the electron density of the benzene ring. It is meta-directing group. The aldehyde group (-CHO) in benzaldehyde is a meta-director as it is an electron-withdrawing in nature.
Tagged under Chemistry · Hydrocarbons · 2018