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Which of the following has the least pungent odour?(a) Methanal(b) Ethanal(c) Propanal(d) ButanalThis question was posed to me by my college director while I was bunking the class.This interesting question is from Aldehydes and Ketones Physical Properties in chapter Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12

Answer»

The CORRECT answer is (d) Butanal

The explanation: As the SIZE of the ALDEHYDE molecule increases, the odour becomes less pungent and more FRAGRANT. Methanal is the most pungent smelling aldehyde.



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