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Which of the following is most reactive ...

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

A

Acetone

B

Formaldehyde

C

Acetadehyde

D

Diethylketone

Text Solution

Verified by Experts

The correct Answer is:
B
Formaldehyde (HCHO) is most reactive towards addition reaction of hydrogen cyanide because it is least sterically hindered.

The order of reactivity towards addition of hydrogen cyanide is a follows :
`underset("Formaldehyde")(HCHO)gtunderset("Acetaldehyde")(CH_(3)CHO)gtCH_(3)-underset("Acetone")overset(O)overset(||)(C)-CH_(3)gtunderset(" Diethyl Ketone")(C_(2)H_(5)-overset(O)overset(||)(C)-C_(2)H_(5))`
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.
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