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Distinguishing Test of Terminal and Non Terminal Alkynes

When ethyne i...

Question

When ethyne is passed through a red hot tube, is formed

Cyclohexane

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Methylbenzene

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Benzene

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Ethane

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Solution

The correct option is C Benzene
Cyclic polymerisation of Alkynes: Ethyne on passing through a red hot iron tube at 873 K undergoes cyclic polymerisation to produce one molecule of benzene.

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873 K

Δ H_{f (C_{2} H_{2}) (g)}^{\circ} = 230 k J m o l^{- 1}

H_{f (C_{6} H_{6}) (g)}^{\circ} = 85 k J m o l^{- 1}

3 C_{2} H_{2} (g) \to C_{6} H_{6} (g)

Δ H_{f (C_{2} H_{2}) (g)}^{o} = 230 k J {m o l}^{- 1}

Δ H_{f (C_{6} H_{6}) (g)}^{o} = 85 k J {m o l}^{- 1}

C_{2} H_{2} (g) ⟶ C_{6} H_{6} (g)

Δ H_{f (C_{2} H_{2}) (g)}^{\circ} = 230 k J m o l^{- 1}

H_{f (C_{6} H_{6}) (g)}^{\circ} = 85 k J m o l^{- 1}

3 C_{2} H_{2} (g) \to C_{6} H_{6} (g)

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