Answer :
Formaldehyde has a double bond.
Formaldehyde is a molecule that consists of one carbon atom coma one oxygen atom and two hydrogen atoms.
In this atom carbon and oxygen contains two bonds between them. There is one Bond present between each hydrogen atom and the carbon atom. Generally, the double bonds are shorter than the single bond because a single double s weaken than a single bond.
Because of the presence of the double bond between the carbon and oxygen molecule we can say that formaldehyde as a double bond.
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