wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

Rank the following compounds in order of decreasing acidic strength :


A
1>2>3>4
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
3>2>4>1
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
4>1>3>2
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
3>1>4>2
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is C 4>1>3>2
More the stability of conjugate base, more is the acidic strength.

The conjugate base so formed after removal of H+ is :




Between 1 and 4 :
In 1, the negative charge is delocalized and stabilized by only I effect of NO2. This is because M effect does not operate at meta-position.
In 4, M effect of NO2 increases the stability of conjugate base.
Since M effect is more dominating than I effect , 4 is more stable than 1
In 3, negative charge is delocalized with non-equivalent resonating structures, so it is less stable than 1 and 4.
In 2 , there is no delocalisation of negative charge, so it is the least stable, and least acidic.
So, the correct order is 4>1>3>2

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
Join BYJU'S Learning Program
CrossIcon