1)It's very easy

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1)It's very easy.

2)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 .

3)By following image you can clear that idea.

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

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

6)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