Increasing order of electron affinity is

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$N < O < Cl < Al$

$N < Al < O < Cl$

$Cl < N < O < Al$

$O < N < Al < Cl$

answer is C.

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Detailed Solution

Increasing order of electron affinity is $N < Al < O < Cl$ , as move from left to right of the periodic table electron affinity increases, Cl has got the highest electron affinity while N has got the least electron affinity due to half-filled stable condition of the p- orbitals.

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