NLN NEX Chemistry Practice Test

Which type of covalent bond involves two electron pairs and is stronger and shorter than a single bond?

Single Bonds Triple Bonds Double Bonds Ionic Bonds

Correct Answer:

Double Bonds

Explanation:

In covalent bonding, how many electron pairs are shared between two atoms directly affects bond strength and length. A double covalent bond involves two electron pairs shared between the same two atoms. This higher bond order pulls the atoms closer together, making the bond shorter and stronger than a single bond, which shares only one electron pair. A triple bond, with three shared pairs, is even stronger and shorter than a double bond, but the description in the question specifically points to two electron pairs. Ionic bonds, on the other hand, result from transfer of electrons and electrostatic attraction between ions, not shared electron pairs, so they are not covalent.

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