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31.
Acetylene has garlic odour. Why?

This is because of the presence of impurities of phosphine and hydrogen sulphide.

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32.

What happens when propyne is oxidised with Baeyer's reagent (alkaline KMnO₄) at 298 - 303 K?

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33.

What happens when propyne is oxidised with alkaline KMnO₄ at 373-383 K?

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34.

What happens when acetylene is treated with ammoniacal silver nitrate solution?

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35.

Write down the structural formulae of the missing compounds:
$CH subscript 3 space minus space straight C space identical to space CH space rightwards arrow with CH subscript 3 MgBr on top space straight A left parenthesis straight a space gas right parenthesis space plus space straight B$