Question

Arrange in increasing order of dipole moment.

$NaF,NaCl,NaBr,NaI$

• A.
• B.
• C.
• D.

Answer 1

The correct option is A

All salts have Na+ ion. The anions are from halogen group.

The size of anions are in the order

$F^{-}<C{l}^{-}<B{r}^{-}<I^{-}$

From Fajan's Rule, $I^{-}$ gets polarized most and $F^{-}$ least.

Thus, charge separation is maximum in $NaF$ and least in $NaI$.

Thus, $NaF$ has the most dipole moment and $NaI$ the least.

The order is $NaF>NaCl>NaBr>NaI$