Chemistry - Complete Pblock- Question with Solution | TestHub

Down group 14, the inert pair effect stabilizes the lower oxidation state, so the stability order is Si(II) < Ge(II) < Sn(II) < Pb(II).
The other orders are wrong: the +3 state becomes less stable down group 13 (A), CF2 is the most stable dihalocarbene, not the least (B), and the +5 state also becomes less stable down group 15 (D).
Answer (C).