Green Chemistry — Prelims Questions

Which of the following principles of Green Chemistry is best exemplified by the use of supercritical carbon dioxide ($scCO_2$) as a solvent in chemical reactions?

Calculate the atom economy for the synthesis of styrene from ethylbenzene via dehydrogenation, given the reaction: $C_6H_5CH_2CH_3 \rightarrow C_6H_5CH=CH_2 + H_2$. (Atomic masses: C=12, H=1)

Which of the following is NOT a direct benefit of using catalysts in chemical processes, according to Green Chemistry principles?

The development of biodegradable plastics that break down into harmless substances in the environment aligns primarily with which Green Chemistry principle?

A chemical manufacturing plant implements a new process where a multi-step synthesis is replaced by a 'one-pot' reaction, eliminating the need for intermediate purification steps and the use of protecting groups. This change primarily exemplifies which two Green Chemistry principles?

Consider the following statements regarding Green Chemistry: I. It aims to eliminate the use of all chemicals in industrial processes. II. Atom economy is a measure of how much of the reactants are converted into desired products. III. Using renewable feedstocks is an example of a proactive approach to pollution prevention. Which of the statements are correct?