Ozonolysis of $2$-methylbut-$2$-ene yields

Which alkene is formed from the following reaction: $CH_3-CH_2-CH_2-CH=PPh_3 + CH_3-CO-CH_2-CH_3$?

The major product of the following reaction is

Which of the following compounds on ozonolysis gives a product that gives a silver mirror with Tollen's reagent?

The formation of isopropyl chloride from the reaction between propene and $HCl$ is based on which of the following?

An alkene $X$ with formula $C_4H_8$ does not exhibit geometrical isomerism. In the conversion of $X$ to $Y$,the correct sequence of reagents $A$ and $B$ used are ($Y$ gives iodoform test):
$X$ $\xrightarrow{A} \text{Intermediate}$ $\xrightarrow{B} Y$