Which of the following groups has a +M (mesomeric) effect?
Solution
-OH has +M effect (donates electron density by lone pair resonance). -NO₂, -CN, -COOH have -M effect (withdraw electron density).
About this question
Subject: Chemistry · Chapter: Organic Chemistry: Basic Principles · Topic: Inductive and Resonance Effects
This question is part of PrepWiser's free JEE Main question bank. 20 more solved questions on Organic Chemistry: Basic Principles are available — start with the harder ones if your accuracy is >70%.