Question

What is the product of an addition reactions between butanol and water?

Answer 1

There isn't one with butanol, but there is with butanal.

Explanation:

I think you mean butanal, not butanol. There is no addition reaction with butanol because it has no `pi`-bonds anywhere.

With butanal, it looks like

`C_4H_8O + H_2O -> C_4H_10O_2`

or, in structural form,

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The double bond on the fourth carbon opens to allow a hydroxyl group, which then lets the original oxygen bond to the remaining hydrogen.