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Question:

Consider the given plot of enthalpy of the following reaction between A and B. A + B → C + D Identify the incorrect statement.

Formation of A and B from C has highest enthalpy of activation

Activation enthalpy of form C is 5 kJ mol⁻¹ less than that to form D

C is the thermodynamically stable product

D is kinetically stable product

Solution:

Correct option is D. Activation enthalpy of form C is 5 kJ mol⁻¹ less than that to form D
A + B → C + D
Activation enthalpy for C = 20 - 5 = 15 kJ/mol
Activation enthalpy for D = 15 - 5 = 10 kJ/mol.