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Which of the alkynes of molecular formula C5H8 can be prepared in good yield by alkylation or, dialkylation of acetylene? Explain why the preparation of

Which of the alkynes of molecular formula C5H8 can be prepared in good yield by alkylation or, dialkylation of acetylene? Explain why the preparation of the other C5H8 isomers would not be practical.

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