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181.
Give two reactions of electrophilic addition on acetylene along with their mechanism.

(i) The addition of halogen: Chlorine and bromine add on to acetylene to form addition product.

Mechanism. It involves electrophilic addition and consists of the following steps:

Step II. The electrophilic addition is repeated again when the final compound gets formed.

(ii) The addition of hydrogen halides. The hydrogen halides (HCl, HBr or HI) add-on triple bond to give rise to haloalkene or haloalkane.

Mechanism. It involves electrophilic addition and consists of the following steps:

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182. Give two reactions of electrophilic addition on acetylene along with their mechanism.

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183.

How do alkynes react with hypochlorous acids? Discuss its mechanism.
Or
$HC space identical to space CH space rightwards arrow with Cl subscript 2 divided by straight H subscript 2 straight O on top space CHCl subscript 2 space minus space CHO$

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Short Answer Type

184.

How does acetylene react with:
(i) Gaseous chlorine
(ii) Liquid bromine?

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Long Answer Type

185.

Starting from acetylene how will you obtain:
(i) Ethylidene iodide
(ii) Dichloro acetaldehyde
(iii) Ethylene?

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186. Give a brief account of the nucleophilic addition in alkynes.
Or
What is the role of Hg²⁺ ions in the nucleophilic addition reaction of alkynes?

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187. How does acetylene react with:
(i) Water in the presence of dilute H₂SO₄and HgSO₄(ii) HCN in the presence of barium cyanide?

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188. Explain the catalytic hydrogenation of alkynes.

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Short Answer Type

189. How will you carry out the following conversions?

left parenthesis straight i right parenthesis space Br subscript 2 CH space minus space CHBr subscript 2 space rightwards arrow space space HC space identical to space CH left parenthesis ii right parenthesis space straight H subscript 3 straight C space minus space straight C space identical to space CH space rightwards arrow space space straight H subscript 3 CCOCH subscript 3

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Long Answer Type

190.

Starting from Ethyne, how will you prepare (No mechanism):
(i) Ethanol (ii) Vinyl chloride (iii) Methyl vinyl ether (iv) Vinyl acetate?

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181. Give two reactions of electrophilic addition on acetylene along with their mechanism.

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Long Answer Type

181.
Give two reactions of electrophilic addition on acetylene along with their mechanism.