How is `K_2Cr_2O_7` prepared ? Write chemical equations.

How is nitrogen prepared in the laboratory? Write the chemical equations

How will you prepare alcohols from sugars ? Write chemical equation.

How will you prepare aldehydes from alcohols ? Write chemical equations.

Discuss the reaction for the preparation of cumene. How can it be converted into phenol ? Write the chemical equations.

How will you prepare the following ? Give chemical equation also. Bleaching powder from Cl_2 .

What are elastomers? Write chemical equation for represent the preparation of Buna-S.

Explain how the colour of a solution of K_2Cr_2O_7 depends on the pH of the solution ?