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Hydrocarbons

Long Answer Type

181.

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

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

138 Views

183.

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

516 Views

Short Answer Type

184.

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

649 Views

Long Answer Type

185.

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

387 Views

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?

398 Views

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

1082 Views

188. Explain the catalytic hydrogenation of alkynes.

510 Views

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

187 Views

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?

(i) Ethanol: It is obtained by the following steps of reaction:

(ii) Vinyl chloride: Ethyne reacts with one mole of HCl to form vinyl chloride.

(iii) Methyl vinyl ether: When ethyne is passed into methyl alcohol at 433-473 K in the presence of small amount of potassium methoxide and under pressure, methyl vinyl ether is formed.

(iv) Vinyl acetate: Acetic acid adds on a molecule of ethyne in the presence of mercury salt to form vinyl acetate.