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a
a(iii), b(ii), c(v), d(i), e(iv)
b
a(iii), b(iv), c(ii), d(i), e(v)
c
a(iii), b(iv), c(v), d(ii), e(i)
d
a(ii), b(iii), c(iv), d(v), e(i)
answer is C.
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Detailed Solution
All the given elements belong to same period and along a period, atomic radii decreases because effective nuclear charge increases. Thus, the order of atomic radii is O < N < C < B < Be ; Be = 111 pm, O = 66 pm, C = 77 pm, B = 88 pm, N = 74 pm.