Question

Lexiving Group CH.CH + Nal + SH I-C-CH3 Substrate Na Coz DMF, A ON NO ON NO2 3,5-Dinitrobenzoic acid MW 212.12 lodoethane MW 155.97 d 1.950 g/mL Ethyl-3,5-Dinitrobenzoate MW 240.18 MP 94-95°C Radhika Patel 2. What does it mean to say that the above nucleophilic substitution reaction is second order? (1)

Answer 1

The above nucleophilic substition reaction is second order means there are two molecules involved in the rate determining step in this reaction.

The rate of bimolecular nucleophilic substitution reactions depends on the concentration of both the haloalkane and the nucleophile.

Rate = K [3,5-Dinitrobenzoic acid] [iodoethane]

if we increase the concentration of both the reactant the rate of reaction will increase 4 times.

Rate = K [2 * (3,5-Dinitrobenzoic acid)] [2 * (iodoethane)]

Rate = 4 * K [3,5-Dinitrobenzoic acid] [iodoethane]

so the second order reaction are those reactions in which the rate of reaction depend upon the two reactants.

Hope it will help u........................