How can I identify ion-dipole forces?

• It's very easy.

• To have a ion-dipole forces there should be a polar molecule and ionic compound Because ion-dipole forces occur due to presence of cations ,anions & a polar molecule .

• By following image you can clear that idea.

• To have a cation & anion there should be an ionic compound.

• So if you want to identify ion-dipole forces you need to find the availability of ionic compound.

• Simply memorize "In a mixture of ionic compound and polar compound there is ion-dipole forces "

This image may helpful

To know more about inter-molecular attraction(secondary interaction) here