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Outermost electronic configuration of 4 elements A, B, C, D A-3s2, B-3s23p1, C-3s23p3, D-3s23p4

Correct order of 1st ionisation enthalpy

(a) B > A > C > D

(b) D > C > B > A

(c) C > D > B > A

(d) D > C > A > B

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(c) C > D > B > A

Ionization energy increases along a period 

But ionisation energy of C-3s23p3 is more than D-3s23p4 as C has half-filled p subshells giving extra stability

∴ Correct order of first ionisation energy is C > D > B > A

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