In presence of peroxide, hydrogen chloride and hydrogen iodide do not give anti-Markovnikov's addition to alkenes because

$2,3$-Dimethyl-$2$-butene can be prepared by heated which of the following compounds with a strong acid?

Acid-catalysed hydration of alkenes except ethene leads to the formation of

$2$-Phenylpropene on acidic hydration gives

Which of the compounds with molecular formula ${\mathrm{C}}_5{\mathrm{H}}_{10}$ yields acetone on ozonolysis ?

Ozonolysis of an alkene produces only one dicarbonyl compound. The structure of the alkene is

The major products obtained during ozonolysis of $2,3$-dimethyl-$1$-butene and subsequent reductions with $\mathrm{Zn}$ and ${\mathrm{H}}_2\mathrm{O}$ are