Match the various sequences with the appropriate orders :

Options

A. I-(b), II-(c), III-(e), IV-(f)
B. I-(c), II-(b), III-(a), IV-(f)
C. I-(b), II-(c), III-(f), IV-(e)
D. I-(d), II-(c), III-(a), IV-(e)

Answer

C

Explanation

Decreasing size of ion is gaseous state `Na^(+) gt Mg^(2+) gt Al^(3+)`
Higher is the positive charge, lower is the size in isoelectronic species
`rArr ` Increasing size of ions in gaseous state `F^(Theta) lt O^(2-) lt N^(3-)`
Higher is the negative charge, larger is the size in isoelectronic species
`rArr` Decreasing order of electron affinity `O gt O^(-) gt O^(2-)`
More is the charge, lower is the zeff, lower is electron affinity
`rArr` Increasing order of `IE_2`
N < F< O
`O^(+) to 2s^(2) 2p^(3) " " F^(+) to 2s^(2) 2p^(4) " " N^(+) to 2s^(2) 2p^(2)`
Half filled electronic configuration is extra stable.