Rank the transition states that occur during the following reaction steps in order of increasing stability (least `rarr` stable)
1. `H_(3)C-overset(+)(O)H_(2) rarr CH_(3)^(+)+H_(2)O`
2. `(CH_(3))_(3)C-overset(+)(O)H_(2) rarr (CH_(3))_(3) C^(+) +H_(2)O`
3. `(CH_(3))_(2) CH- overset(+)(O)H_(2) rarr (CH_(3))_(2)CH^(+) +H_(2)O`

Options

A. I lt II lt III
B. II lt III lt I
C. I lt III lt II
D. II lt I lt III

Answer

C

Explanation

The stability order depends upon the formation of carboncation. The more the stable carbocation is formed the higher will be stability order of transition state. The stability order of carbocation is `3^(@) gt 2^(@) gt 1^(@)`
`therefore` The correct order will be `1 lt 3 lt 2`