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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.

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183.

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

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?

(i) Ethylidene iodide. It is obtained by the action of acetylene with HI.

(ii) Dichloro acetaldehyde. Acetylene reacts with hypochlorous acid to form dichloro acetaldehyde
.

(iii) Ethylene. Acetylene reacts with hydrogen in the presence of Lindlar’s catalyst (Pd poisoned with CaCO₃) to form 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?

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?

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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?

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Previous Year Papers

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Long Answer Type

Short Answer Type

Long Answer Type

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

Short Answer Type

Long Answer Type

185.
Starting from acetylene how will you obtain:
(i) Ethylidene iodide
(ii) Dichloro acetaldehyde
(iii) Ethylene?