Identify the product 'B' in the following reaction.

Toluene $\xrightarrow[\mathrm{CS}_2]{\text { Chromylchloride }} \mathrm{A} \xrightarrow{\mathrm{H}_3 \mathrm{O}^{+}} \mathrm{B}$

Which of the following is obtained on oxidation of prop-1-ene with acidic $\mathrm{KMnO}_4$ ?

Which from following has highest boiling point?

Identify the alkene obtained as major product in the following Hofmann elimination reaction. $$ \left(\mathrm{C}_3 \mathrm{H}_7\right) \mathrm{N}^{\ominus}\left(\mathrm{C}_2 \mathrm{H}_5\right)_3 \mathrm{I}^{\ominus} \xrightarrow[\Delta]{\text { mois } \mathrm{A}_2 \mathrm{O}} \mathrm{~A} \xrightarrow[\text { Alkene }+\mathrm{H}]{\stackrel{-\mathrm{H}_2 \mathrm{O}}{ }} $$ $\mathrm{Alkene + Amine}$