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Q.

In which of the following arrangements the order is NOT according to the property indicated against it

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a

Al3+  <  Na+ < F− : Increasing ionic size

b

B < C < N < O : Increasing first ionisation enthalpy

c

I < Br < F < Cl : Increasing electron gain enthalpy (with negative sign)

d

Li < Na < K < Rb : Increasing metallic radius

answer is B.

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Detailed Solution

B < C < N < O; When we move from B to N in a periodic table the first ionization enthalpy increase due to the attraction of nucleus towards the outer most of electron.But I.P of N > I.P of O ; due to half-filled configuration of N.
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In which of the following arrangements the order is NOT according to the property indicated against it