Number of shared electrons between carbon-carbon atoms in an ethylene molecule is

Which compound would give $5-$keto$-2-$methylhexanal upon ozonolysis?

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 ..........

The reaction of $CH_3-CH=C(CH_3)-CH=CH_2$ with $(1) \ O_3$ followed by $(2) \ H_2O, Zn$ gives which products?

Addition of $HBr$ to propene in the presence of a peroxide takes place contrary to Markovnikov rule. This can be explained by the mechanism involving

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