In the case of alkali metals, the covalent character decreases in the order:a)MCl MI MBr MFb)MF MCl MBr MIc)MF MCl MI MBrd)MI MBr MCl MFCorrect answer is option 'D'. Can you explain this answer?

Question

In the case of alkali metals, the covalent character decreases in the order:a)MCl > MI > MBr > MFb)MF > MCl > MBr > MIc)MF > MCl > MI > MBrd)MI > MBr > MCl > MFCorrect answer is option 'D'. Can you explain this answer?

Answer

The covalent character of alkali metal compounds generally decreases as we move down the group.

The order of decreasing covalent character for alkali metal compounds, such as MCl (where M represents an alkali metal), is as follows:

1) LiCl (lithium chloride)
2) NaCl (sodium chloride)
3) KCl (potassium chloride)
4) RbCl (rubidium chloride)
5) CsCl (cesium chloride)

Lithium chloride (LiCl) has the highest covalent character among alkali metal chlorides, while cesium chloride (CsCl) has the lowest covalent character. This trend can be attributed to the increasing size of the alkali metal cation as we move down the group, which leads to weaker electrostatic attractions between the cation and the chloride anion. Consequently, the ionic character increases and the covalent character decreases.

Answer

According to Fajan's rule the covalent character increases:
1. with the increase in size of anions.
2.with the decrease in size of cations.
As here cation size is constant while the ion size decreases in the order I,Br,Cl,F hence covalent character decreases as MI,MBr,MCl,MF

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