First slide

Alkynes

Question

Which of the following can be obtained on Hydroboration oxidation reaction of Propyne?

Moderate

A

Propanone
B

Propanal
C

Propanol
D

Acetaldehyde

Solution

${3CH}_{3} –C \equiv C–H \overset{{BH}_{3}}{\to} {{(CH}_{3} –CH=CH-)}_{3} B \overset{H_{2} O_{2},NaOH}{\to} {3CH}_{3} –CH=CH–OH \underset{}{⇌} {3CH}_{3} {–CH}_{2} –CHO$
In the above reaction we can see the reaction follows anti Markonikovs addition followed by oxidation. In last step tautomerism will occur

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