1. Tardigrade
  2. Question
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  4. Which of the followings is most reactive towards addition reaction of hydrogen cyanide to form corresponding cyanohydrin?

Q. Which of the followings is most reactive towards addition reaction of hydrogen cyanide to form corresponding cyanohydrin?

 2830  186 MHT CETMHT CET 2018Aldehydes Ketones and Carboxylic Acids Report Error

Solution:

Formaldehyde (HCHO) is most reactive towards addition reaction of hydrogen cyanide because it is least sterically hindered.

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The order of reactivity towards addition of hydrogen cyanide is a follows:

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Note In case of ketones, only acetone, butanone, pentan-3-one and pinacolone form cyanohydrin. The failure with bulky ketones is largely due to steric effects