`S_(N^(1))` reaction is a first order nucleophilic substitution e.g.
`CH_(3)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)C-Br+H_(2)Oto CH_(3)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)C-OH+HBr`
The concentration of nucleophile does not appear in the rate law expression.
Reaction rate k[RX]
In a mulptistep organic reaction , the rate-limiting step is the slowest step . Rate determining step is represented by the following energy level diagram:

A reaction energy level diagram for an `S_(N^(1))` reaction .The rate limiting step is spontaneous dissociation of an alkyl halide to give a carbocation intermediate:

Select the correct statement (s) about the graph 1:

Options

A. first step is rate determining and it is endothermic
B. first step is rate determining and it is exothermic
C. second step is rate determining and it is exothermic
D. second step is rate determining and it is endothermic

Answer

A