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Propanal has a slightly higher boiling point than propanone.

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in Chemistry – Class 12 by (188k points)
Propanal has a slightly higher boiling point than propanone.

(a) True

(b) False

I got this question in exam.

My doubt stems from Aldehydes and Ketones Physical Properties topic in chapter Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12

1 Answer

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Correct option is (b) False

The explanation is: Propanone has two CH3 groups, one on either side of the CO group, whereas propanal has only one CH3CH2 group. This makes propanone more polar because of the higher electron releasing effect of two alkyl groups. The boiling point of propanal is 322K and that of propanone is 329K.

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