A) C > B > Be > Li
B) C > Be > B > Li
C) B > C > Be > Li
D) Be > Li > B > C
Correct Answer: B
Solution :
lonisation energy increases with decrease in size from moving left to right in a period. But due to stable \[n{{s}^{2}}\] configuration first ionization energy of group IIA elements is higher than that of group IIIA elements. Hence, correct option is C > Be > B > Li.
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