The product obtained by heating $(NH_4)_2SO_4$ and $KCNO$ is

Which is the most precise designation of stereochemistry for the products formed in the electrophilic addition of $DBr$ to $1$-methylcyclohexene? ($D = {}^2H$,an isotope of hydrogen)

Given below are two statements.
Statement $I$: On heating with $KHSO_4$,glycerol is dehydrated and acrolein is formed.
Statement $II$: Acrolein has fruity odour and can be used to test glycerol's presence.
Choose the correct option.

Which among the following statements is $NOT$ true about aliphatic compounds?

The main product of the following reaction is:

The product of the reaction shown is: