Ethanal is prepared industrially by air oxidation of ethylene using palladium chloride as catalyst and _________ as promoter?
Correct answer: C. CuCl2
- A. PdCl2
- B. Cu2Cl2
- C. CuCl2
- D. PbCl2
Explanation
Industrial oxidation of ethene to ethanal by the Wacker process uses PdCl2 as the catalyst and CuCl2 as the promoter or co-oxidant. CuCl2 reoxidizes reduced palladium species so the catalytic cycle can continue. Students may choose a because PdCl2 is prominent in the reaction, but it is the catalyst, not the promoter.
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About Preparation of Aldehydes and Ketones
Aldehydes and ketones are prepared mainly by controlled oxidation or dehydrogenation of primary and secondary alcohols, respectively. The topic also includes ozonolysis of alkenes, hydration of alkynes and preparation through acyl derivatives, with attention to why primary alcohols can give aldehydes whereas secondary alcohols give ketones.
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679 free Aldehydes and Ketones MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
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