Due to the inability of the reaction to take place, the yield of 1-Bromobutane would drop.
Since 1-Butanol won't react with the additional sodium bromide, bromination won't happen.
If water had been supplied, the equilibrium would have shifted extremely far to the left, preventing the reactants from interacting with the acid and favoring the yield of 1-bromobutane instead.
What is Bromination?
When a substance undergoes bromination, bromine is added to the compound as a result of the chemical reaction.
After bromination, the result will have different properties from the initial reactant.
For example, an alkene is brominated by electrophilic addition of [tex]Br_{2}[/tex].
Benzene ring bromination by electrophilicaromatic substitution.