First slide

Alkynes

Question

Non symmetrical internal alkyne on Kucherov reaction gives.

Moderate

A

Acetaldehyde
B

Methyl ketone
C

Single ketone
D

Mixture of ketones

Solution

$Note: (i) Acetylene (CH \equiv CH) gives acetaldehyde (ii) Terminal alkyne (R - C \equiv CH) gives {RCOCH}_{3} (Methyl ketone) (iii) Symmetrical internal alkyne (R - C \equiv C - R) gives a single ketone ({RCOCH}_{2} R)$

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