A) i> ii> iv> iii
B) iii> i> ii> iv
C) iv> ii> iii> i
D) ii> iv> iii> i
Correct Answer: D
Solution :
[d]
(i) Bridgehead carbocations are unstable due to Bredt?s rule. Stability of carbocation \[\propto +I\]effect s-character \[\propto \]electronegativity \[\propto +\frac{I}{+Ieffect}\] 
Thus (iii) is least stable Stability order of carbocation is \[3{}^\circ >2{}^\circ >1{}^\circ \] Order of stability (ii)> (iv)> (iii)> (i)
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