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Hydrocarbons

Short Answer Type

31.

Acetylene has garlic odour. Why?

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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:
$CH subscript 3 space minus space straight C space identical to space CH space rightwards arrow with CH subscript 3 MgBr on top space straight A left parenthesis straight a space gas right parenthesis space plus space straight B$

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36.

Mention two reagents which can be used to distinguish between ethene and ethyne.

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37.
Although acetylene is acidic in nature, yet it does not react with NaOH or KOH. Explain.

Acetylene has an acidic nature. It means it has an acidic tendency or it can loose proton if provided a suitable reagent. It is not a strong acid to react with a weak base like Na₂CO₃. Even NaOH or KOH also does not react. Only Bases like NaNH₂ (sodamide) or Tollens reagent and few other are able to replace H⁺ of acetylene by the metal.