Question
Which of the following reactions is not of the first order?
A.
Inversion of sucrose in the presence of acid
B.
Acid-catalyzed hydrolysis of ethyl acetate
C.
Hydrolysis of tertiary butyl halide using alkali
D.
Oxidation of $${I^ - }\,ion$$ by $${S_2}O_8^{2 - }\,ion$$
Answer :
Oxidation of $${I^ - }\,ion$$ by $${S_2}O_8^{2 - }\,ion$$
Solution :
It is a second order reaction, first order both $$w.r.t\,{S_2}{O_8}^{2 - }$$ and $${I^ - }.$$
$$\therefore \,\,r = k\left[ {{S_2}{O_8}^{2 - }} \right]\left[ {{I^ - }} \right]$$
All other options are of first order reaction.