Deuterium is the isotope of hydrogen of mass number `2`, with a proton and a neutron in its nucleus. The chemistry of deuterium is nearly identical to the chemistry of hydrogen, except that `C-D` bond is slightly `(5.0 "KJ" //"mole")` stonger than the `C-H` bond. Reaction rates tend to be slower if a `C-D` bond as opposed to a `C-H` bond is broken in a rate limiting step. This effect on the rate is called a kinetic isotope effect.

Options

A. `(K_(H))/(K_(D))=1`
B. `(K_(H))/(K_(D))~~4`
C. `(K_(D))/(K_(H))~~4`
D. `(K_(D))/(K_(H))~~2`

Answer

B

Explanation

As deprotonation step in case of iodination is rate determinining.