The correct stability order for the following species is
A
II > IV > I > III
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
I > II > III > IV
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
II > I > IV > III
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
I > III > II > IV
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution
The correct option is D I > III > II > IV (I) and (III) are resonance stabilised by the oxygen group so they are more stable than (II) and (IV). Stability of carbocation ∝Number of α−H
(IV) is least stabilised because it is a primary carbocation.
Comaparing (I) and (II)
(I) is tertiary carbocation and it is resonance stabilised by oxygen atom.
(III) is also resonance stabilised but it is a secondary carbocation. Since tertiary carbocation is more stable than secondary, (I) is the more stable carbocation than (III)
Thus, order of stability of the carbocation is
(I) > (III) > (II) > (IV)