Ethylene reacts with bromine to form

Which alkene undergoes ozonolysis to produce $2,6-$heptanedione?

In the reaction $CH_2 = CH_2$ $\xrightarrow[\text{acid}]{\text{Hypochlorous}} M$ $\xrightarrow{R} \begin{array}{c} CH_2OH \\ | \\ CH_2OH \end{array}$,$M$ and $R$ are respectively:

What is the product of the reaction of cyclohexene with Baeyer's reagent?

Addition of $OsO_4$ to cyclopentene would give a product which is

What is the product of the following reaction?