Dehydration of ethanol gives

Which of the following alkenes cannot be prepared by the deamination of $n-butylamine$ $(n-BuNH_2)$ with $NaNO_2/HCl$?

In the reaction $CH_2 = CH_2$ $\xrightarrow[\text{acid}]{\text{Hypochlorous}} M$ $\xrightarrow{R} \begin{array}{c} CH_2OH \\ | \\ CH_2OH \end{array}$,$M$ and $R$ are respectively:

Identify the final product $Y$ in the following reaction sequence:
$CH_2=CH_2$ $\xrightarrow{O_2/Ag} X$ $\xrightarrow{473 \ K} Y$

What is the product formed when $trans-2$-butene reacts with $D_2$ in the presence of a $Ni$ catalyst?

The Diels-Alder reaction will not take place with which of the following reactants?