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Question
Q449) Identify the least stable among the following ... [ IIT 2002]




SOLUTION

E.C. of Li-=1s2, 2s2
Be-=1s2 2s2 2p1
B-=1s2 2s2 2px1, 2py1
C-=1s2 2s2 2px1, 2py12pz1
Evidently the least stable is Be-sr/>Answer: (b)