Question
How are the following compounds obtained from alkynes :
$(1)$ Acetaldehyde
$(2)$ Acetone?
$(1)$ Acetaldehyde
$(2)$ Acetone?
✓
Answer
$1.$ Acetaldehyde : On passing acetylene through warm $40\% \ H_2SO_4$ in the presence of $1 \% \ H_gSO_4,$ vinyl alcohol is obtained which tautomerises and forms acetaldehyde. It is a hydration reaction.
$2.$ Acetone : On passing propyne through warm $40 \% \ H_2SO_4$ in the presence of $1 \% \ H_gSO_4,$ alkenol is obtained which on tautomerisation form acetone.
$2.$ Acetone : On passing propyne through warm $40 \% \ H_2SO_4$ in the presence of $1 \% \ H_gSO_4,$ alkenol is obtained which on tautomerisation form acetone.
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