Question

Explain the acidic character of acetylene

Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

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Explanation:

Physical properties:

Physical properties are smaller to alkenes and alkanes.

First three are gases, next eight are liquids and higher ones are solids.

These are insoluble in water and soluble in organic solvents.

Chemical properties:

a) Acidic character of acetylene: Acetylene reacts with sodamide to form sodium acetylide with liberation of hydrogen gas.

HC ≡ CH + Na → HC ≡ C⁻ Na⁺ + ½ H₂

Mono sodium ethynide

The acidic character of ethyne compared to ethene and ethane is due to the greater percentage of S-Character.

In acetylene the percentage of s-character is 50% when as in case of ethylene and ethane are 33.3% and 25% respectively.

Only hydrogen atoms attached to triply bonded carbon atoms are acidic in nature.

CH₃ – C ≡ CH + Na⁺ NH₂⁻ → CH₃ – C ≡ C⁻ Na⁺ + NH₃

b) Addition of reagent: Due to presence of triple bond alkynes undergo addition reactions with hydrogen and halogens, hydrogen halides.

c) Addition of dihydrogen:

HC≡CH+H2−→−−−−−Pt/Pd/Ni[H2C=CH2]−→H2CH3−CH3

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