Which of the following is correctly matched?

Identify the reagents $X, Y, Z$ for the following dehydration reactions of alcohols:
$CH_3-CH_2-OH \xrightarrow{X} CH_2=CH_2 + H_2O$
$CH_3-CH(OH)-CH_3 \xrightarrow{Y} CH_3-CH=CH_2 + H_2O$
$(CH_3)_3C-OH \xrightarrow{Z} (CH_3)_2C=CH_2 + H_2O$

Show the $\beta$-elimination reactions for the following alcohols:
$(i)$ Propyl alcohol
$(ii)$ Isopropyl alcohol
$(iii)$ Cyclohexanol
$(iv)$ Tertiary-butyl alcohol.

$CH_2=CH-CH(OH)-CH_2-CH_2OH \xrightarrow{MnO_2} A$. $A$ is:

Alcohols react with Grignard reagent to form

Which of the following statements is correct regarding the rate of dehydration in alcohols?