# In the case of alkali metals, the covalent character decreases in the order: Option 1) $MF> MCI> MBr> MI$ Option 2) $MF> MCI> MI> MBr$ Option 3) $MI> MBr> MCI> MF$ Option 4) $MCI> MI> MBr> MF$

D Divya Saini

As we learned in concept

Dipole moment of Hydride -

HF>HCl>HBr>HI

- wherein

Deacreses due to decrease in electronegativity difference

As electronegativity difference between catron and anion decreases in addition to the increase in size of the onion (size and polarizability), the coualent character increases too. So, as we go down the group, the covalent character increases i.e $M_{1}>MBr>MCI>MF$

Option 1)

$MF> MCI> MBr> MI$

This option is incorrect

Option 2)

$MF> MCI> MI> MBr$

This option is incorrect

Option 3)

$MI> MBr> MCI> MF$

This option is correct

Option 4)

$MCI> MI> MBr> MF$

This option is incorrect

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