Tetrachloromethane/tetrafluoromethane boiling pointsWatch
Is this to do with larger dipoles from chlorine?
This year is the last year of the current OCR A spec (F321-F326) and they called them VdW forces.
The new spec (Y12 kids doing currently) starting this year calls intermolecular forces as a group VdW forces and (correctly) calls just id-id forces as LDF.
OCR B has always done it correctly, I understand.