S-1:- `IE_(1)` of `Sr gt Rb` but `IE_(2)` for `Rb gt Sr`
S-2:- The ionic radii of `Li^(+)`, `K^(+)`, `Mg^(2+)` and `Al^(3+)` in `A^(@)` are `0.76, 1.38, 0.720, " and " 0.535` respectively.
S-3:- The negative value of electron gain enthalpy of `Cl gt F` because there is weak electron-electron repulsions in the bigger 3p-subshell of Cl as compared to compact 2p-subshell of F.
S-4:- The second ionisation energy of copper is less than potassium.

Options

A. FFTT
B. TTFT
C. TTTF
D. TTTT

Answer

D