Which of these dehydrates most easily?

Oxidation of ethanol by chromic acid forms

Which of the following substances acts as a dehydrating agent for alcohols?

Which of the following is $NOT$ produced by the reaction of ethanol with $H_2SO_4$?

The reaction of $2$-cyclohexylethanol with $H^{\oplus}$ and $\Delta$ yields a major product $A$. Identify $A$.

$Ph-C(OH)(Ph)-C(OH)(CH_3)_2$ $(A)$ $+$ $Ph-C(OH)(Ph)-C(OH)(Et)_2$ $(B)$ $\xrightarrow{H_2SO_4}$
$(p)$ $Ph-C(Ph)(CH_3)-CO-CH_3$
$(q)$ $Ph-C(Ph)(Et)-CO-Et$
$(r)$ $Ph-C(Ph)(Et)-CO-CH_3$
$(s)$ $Ph-C(Ph)(CH_3)-CO-Et$
When $(A)$ and $(B)$ react with $H_2SO_4$,the products obtained are: