Which of the following order is correct for the property mentioned in brackets?

Options

A. `S^(2-) gt Cl^- gt K^(+) gt Ca^(2+) ` (Ionisation energy )
B. ` C < N < F < O (`2^(nd)` Ionisation energy ) '
C. B > Al > Ga > In > Tl (elctronegativity)
D. `Na^(+) gt Li^(+) gt Mg^(2+) gt Be^(2+) gt Al^(3+)` (Ionic radius )

Answer

B

Explanation

(a) Correct order ` to Ca^(2+) gt K^(+) gt Cl^(-) gt S^(2-)` (ionization energy ). For isoelectronic species (I.E `prop Z_(eff) ` )
(b) Correct order ` to ` C < N < F < O (2nd I.E.). Second electron removal from O requires more energy as it acquires stable `2s^(2) 2p^3` configuration after removal of one electron.
(c )Correct order `to ` B > Tl > IN > Ga > Al (Electronegativity) In general EN increases in boron family from top to bottom due to increase in `Z_(eff)` on valence shell while boron has highest E.N. due to its very small size.
(d) Correct order ` to Na^(+) gt Li^(+) gt Mg^(2+) gt Al^(3+) gt Be^(2+)` (Ionic radius) Ionic radius depends on and number of shells .