Question

multiple bonds behave as a single electron pair bond in structure determination​

Answer 1

Answer:

They don’t behave like other bonds.

So we have single bond between two s electrons.

The bond can rotate and bend. Stretch as well.

This gives us interesting IR spectra, plus others.

We then have double bonds eg. Ethylene

CH2=CH2 it has an s bond plus a pi bond.

They cannot rotate.

It’s polymer is polyethylene. You can have Low Density and High Density Polyethylene. Put a chloride atom instead of a hydrogen atom and we have Vinyl chloride.

It’s polymer is of course PVC.

Put a Methyl group in instead of a Hydrogen and we have Polypropylene.

Put a Benzene group in and we have polystyrene.

etc, etc

We can then have a triple bond and just CH each

end and we have the gas acetylene. I sigma and two pi bonds. Of course it cannot rotate.

So they don’t behave the same.

The nomenclature goes back to the 1970’s , when I took my degree.