NTA Abhyas JEE Main2020ChemistryHaloalkanes and HaloarenesPractice
Consider the following bromides The correct order of S N 1 reactivity is
Options
- AA > B > C
- BB > C > A
- CB > A > C
- DC > B > A
Correct answer
B. B > C > A
Step-by-step solution
S N 1 reaction rate depends upon the stability of the carbocation, as carbocation formation is the rate determining step compound (ii), forms at 2 ° allylic carbocation which is the most stable, the next stable carbocation is formed from (iii), it is a 2 ° carbocation, (i) forms the least stable 1 ° carbocation, the order of reactivity is thus,