What is the major product expected from the following reaction?
Where $D$ is an isotope of hydrogen.

Ozonolysis of an alkene with molecular formula $C_{7}H_{14}$ in the presence of $Zn$ dust gives a mixture of acetone and $butan-2-one$. The $IUPAC$ name of the alkene is ..........

When $2-$Methylbut$-2-$ene is treated with hydrogen chloride,the major product formed is

An alkene $A$ (molecular formula $C_{5}H_{10}$) on ozonolysis gives a mixture of two compounds $B$ and $C$. Compound $B$ gives a positive Fehling's test and also forms iodoform on treatment with $I_{2}$ and $NaOH$. Compound $C$ does not give Fehling's test but forms iodoform. Identify the compounds $A, B$ and $C$. Write the reaction for ozonolysis and the formation of iodoform from $B$ and $C$.

The product of the following reaction will be:

Give the major product of the reaction: