Why are single bonds longer than double?

Answer 1

See here.

Where there is more electron density, such as in a double bond, the positively charged nuclei can approach each other more closely and shorten the bond. This is how electrostatic attraction between the positively charged nuclei and the electron cloud overcomes nucleus-nucleus repulsion, as explained in the link.

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Answer 2

Addison Armstrong

Single bonds are longer than double bonds because in a single bond, there is only one pair of electrons shared between two atoms, whereas in a double bond, there are two pairs of electrons shared. The presence of additional electron pairs in a double bond results in stronger electrostatic attraction between the bonded atoms, pulling them closer together and thus shortening the bond length compared to a single bond.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.