Given below are two statements labelled as Assertion (A) and Reason (R)
Assertion (A): Electron gain enthalpy of oxygen is less than that of Flourine but greater than Nitrogen.
Reason (R): Ionisation enthalpies of the elements follow the order Nitrogen `gt` Oxygen `gt` Fluorine
Select the most appropriate answer from the options given below:

Options

A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.

Answer

C

Explanation

Assertion : Electron gain enthalpy of oxygen is less than that of fluorine but greater than Nitrogen (correct)
Reason : Ionisation enthalpies of the elements follow the order Nitrogen `gt` Oxygen `gt` Fluorine (incorrect)
Ionisation enthalpies of the elements follow the order Fluorine `gt` Nitrogen `gt` Oxygen
Explanation : The ionisation enthalpy of fluorine would be maximum because of its small size while nitrogen has more IE than oxygen atom because of its stable half filled electronic configuration.