Write condition under which a bimolecular reaction is kinetically first order. Given an example of such a reaction. (Given: log 2 = 0.3010, log 3 = 0.4771, log 5 = 0.6990)

A bimolecular reaction can be kinetically first order in behavior if one of the reactants is taken in such a large excess that its concentration may hardly change.

Example:
CH3COOC2H5 + H2O → H+ CH3COOH + C2H5OH

Rate = K[CH3COOC2H5][H2O]

If H2O is in large excess, then:
Rate = K'[CH3COOC2H5]
where K' = K[H2O]