How many primary alcohol isomers are there for $C_5H_{11}OH$?

In the given reaction,find the value of $x$,where $x$ is the number of moles of acetic anhydride $(Ac_2O)$ consumed.

An alcohol $X$ $(C_4H_{10}O)$ on dehydration gives an alkene $(C_4H_8)$ as the major product,which on bromination followed by treatment with $Y$ gives an alkyne $C_4H_6$. The alkyne $C_4H_6$ does not react with sodium metal. What are $X$ and $Y$?

$X$ and $Y$ respectively are

Give the structures of the products you would expect when each of the following alcohols reacts with $(a)$ $HCl - ZnCl_{2}$,$(b)$ $HBr$,and $(c)$ $SOCl_{2}$: $(i)$ $Butan-1-ol$,$(ii)$ $2-Methylbutan-2-ol$.

Write the mechanism of acid dehydration of ethanol to yield ethene.