What is the product when Neopentyl alcohol is treated with HBr?

Q. Which of the following products will be obtained when neopentyl alcohol is treated with conc. $HCl$ in presence of $Zn{Cl}_2?$

Q.

The final product formed when ethyl bromide is treated with excess of alcoholic KOH is

Q.

When acetylene is treated with HBr,the product is:

Q. What is the product formed when ethyl alcohol is treated with $PCC$?

Q. The product formed when
1,2-Dimethylcyclohexene is treated with $HBr$ is: