JEE Main 2019 Chemistry question

Chemistry Classification of Elements and Periodicity in Properties JEE Main 2019

In comparison to boron, beryllium has:

(A)lesser nuclear charge and greater first ionisation enthalpyCorrect
(B)greater nuclear charge and greater first ionisation enthalpy
(C)greater nuclear charge and lesser first ionisation enthalpy
(D)lesser nuclear charge and lesser first ionisation enthalpy

Answer: (A)

Solution

Be (2s, filled) has higher IE than B despite Z = 4 < 5.

Question ID VK-010791