Question

Arrange the following elements in increasing order of first ionization enthalpy: 

Li, Be, B, C, N 

Choose the correct answer from the options given below: 

(1) Li < Be < B < C < N 

(2) Li < B < Be < C < N 

(3) Li < Be < C < B < N 

(4) Li < Be < N < B < C

Answer 1

Correct option is (2) Li < B < Be < C < N 

Increasing order of first ionization enthalpy is Li < B < Be < C < N

Element	First ionization enthalpy \((\Delta _iH/kJ mol^{-1})\)
Li	520
Be	899
B	801
C	1086
N	1402