# How can you solve addition reactions?

Apr 9, 2016

Addition reactions open a double or triple bond and the new atoms are simply added in.

#### Explanation:

Addition reaction happen with alkenes and alkynes - hydrocarbons that have double or triple bonds. This is because the $\pi$-bonds open and become $\sigma$-bonds with the new atoms, which are added on.

In terms of the equation, addition reaction are very easy to solve. They look very straightforward. For example,

${C}_{2} {H}_{4} + B {r}_{2} \to {C}_{2} {H}_{4} B {r}_{2}$.

You can see how obvious that looks. Nothing is taken away or swapped - it is just straight-up addition.

It's easy to think about a double or triple bond as a gate. When new atoms are added, it simply opens to accept them. A triple bond in an alkyne opens once to become a double bond, and opens again to become a single bond.

This is a basic formula for addition reactions.

Nothing changes, only a double or triple bond opens and the new atoms are added in.