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

Select the reagent for the following reaction,

Among the following, the alkene on ozonolysis giving rise to only one aldehyde as the product is

Products of the following reaction ${\mathrm{Me}}_2\mathrm{C}={\mathrm{CHCH}}_3\underset{\left(\mathrm{ii}\right) ({\mathrm{CH}}_3{)}_2\mathrm{S}}{\overset{\left(\mathrm{i}\right) {\mathrm{O}}_3}{\to }}?$ are