Haloalkanes and Haloarenes

The fastest reaction with aqueous acetone solution is given by:
Write down the mechanism of alkaline hydrolysis of tertiary butyl bromide?
Which of the following is the correct order of decreasing $${S_N}{2}$$ reactivity?
Write the structure of the alkene formed by dehydrohalogenation of $$1$$-bromo-$$1$$-methylcyclohexane with alcoholic KOH.
Product $$P$$ and $$Q$$ are: