Q. In the case of alkali metals, the covalent character decreases in the order:
A) MF > MCl > MBr > MI
B) MF > MCl > MI > MBr
C) MI > MBr > MCl > MF
D) MCl > MI > MBr > MF
Explanation
[Solution from source] By Fajans' rules, larger anions are more easily polarised by the cation, so covalent character is highest for iodides and lowest for fluorides: MI > MBr > MCl > MF. The reverse order describes ionic character. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.