In light of your answer to Problem $11.45,$ what product might you expect from treatment of 4-bromo-1-butanol with base?
$$\mathrm{Br} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{OH} \quad \stackrel{\text { Base }}{\rightarrow} ?$$