Ethylene reacts with Baeyer's reagent to give

The alkene which on ozonolysis yields acetone is

The number of alkene$(s)$ which can produce $2-butanol$ by the successive treatment of $(i)$ $B_{2}H_{6}$ in tetrahydrofuran solvent and $(ii)$ alkaline $H_{2}O_{2}$ solution is:

Presence of peroxides affects the addition of

Product $(A)$ is:
(cyclobutylidene)methylcyclopropane + $HBr \rightarrow A$ (Major)

In the following reaction $CH_3-C(CH_3)_2-CH=CH_2 \xrightarrow{H_2O/H^{+}} A \text{ (major)} + B \text{ (minor)}$,the major product $A$ is: