NTA Abhyas JEE Main2020ChemistryHaloalkanes and HaloarenesPractice
Rank the following compounds in decreasing order of reactivity in electrophilic aromatic substitution reaction
Options
- A3 > 1 > 2 > 4
- B4 > 3 > 2 > 1
- C3 > 1 > 4 > 2
- D1 > 3 > 4 > 2
Correct answer
C. 3 > 1 > 4 > 2
Step-by-step solution
Rate of electrophilic aromatic substitution is effected by group/s already present. If they - O - , - N H - , - C H 2 - are ring activating and ortho, para directing due to +R and +H effects reactivity is more but if they - C O - , - N O 2 , - C N are ring deactivating and meta directing groups due to -R and -H effects reactivity decreases. Here reactivity order is 3 > 1 > 4 > 2.