The balanced equation is C?H? + Br? → C?H?Br?

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The balanced equation is C?H? + Br? → C?H?Br?.

You do not state any special conditions, so I assume that this is a thermal rather than a photochemical reaction.

You know that this is not an alkane, because its formula is not C?H? (##C_nH_(2n+2)##).

It is missing two H atoms, so it must contain either a ring (cyclopropane) or a double bond (propene).

Cycloalkanes do not react readily with bromine, so the compound must be propene.

The reaction is the addition of bromine to a C=C double bond.

(using structural formulas) or

CH?CH=CH? + Br? → CH?CHBrCH?Br (condensed structural formulas) or

C?H? + Br? → C?H?Br? (molecular formulas).

You will see the reddish brown colour of bromine disappear as rapidly as you add it to the reaction mixture.