Which of the following compounds has highest boiling point?

Which of the following is obtained as product when ethylene reacts with oxygen in presence of $$\mathrm{Pd} / \mathrm{Al}_2 \mathrm{O}_3$$ ?

Which of the following is general representation of Grignard reagent?

Identify the product P obtained in following reaction.

Benzene + ozone (excess) $$\stackrel{\mathrm{CCl}_4}{\longrightarrow}$$

Benzene triozonide $$\stackrel{\mathrm{Zn} / \mathrm{H}_2 \mathrm{O}}{\longrightarrow} \mathrm{P}+\mathrm{H}_2 \mathrm{O}_2$$