Q.

When acetylene is passed into methanol at 160-200°C in the presence of a small amount of potassium methoxide and under pressure, the following is formed:

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a

Divinyl ether

b

Dimethyl ether

c

Polyvinyl alcohol

d

Methyl vinyl ether

answer is D.

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Detailed Solution

When acetylene is passed into methanol at 160°00 -200°C in the presence of a small amount(I-2%) of potassium methoxide and under pressure just high enough to prevent boiling, methyl vinyl ether is formed.The mechanism is believed to involve nucleophilic attack in the first step.HC≡CH+CH3O⊖→C⊖H=CHOCH3⟶CH3OHCH2=CH2OCH3+CH3O⊖                                                                                   Methyl vinyl ether
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When acetylene is passed into methanol at 160-200°C in the presence of a small amount of potassium methoxide and under pressure, the following is formed: