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Ethyne (C2H2) is unsaturated hydrocarbo...

Ethyne `(C_2H_2)` is unsaturated hydrocarbon. Explain.

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### Step-by-Step Solution: 1. **Definition of Hydrocarbons**: Hydrocarbons are organic compounds made up entirely of hydrogen and carbon atoms. They can be classified into two main categories: saturated and unsaturated hydrocarbons. 2. **Saturated vs. Unsaturated Hydrocarbons**: - Saturated hydrocarbons contain only single bonds between carbon atoms. They have the maximum number of hydrogen atoms attached to the carbon skeleton (e.g., alkanes like ethane, `C2H6`). - Unsaturated hydrocarbons contain one or more double or triple bonds between carbon atoms. This means they have fewer hydrogen atoms compared to saturated hydrocarbons with the same number of carbon atoms. ...
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i. (A), a compound with lowest number of C atoms, is unsaturated hydrocarbon and is optically active. ii. (B), a compound with lowest number of C atoms, is unsaturated hydrocarbon and shows diastereomerism. iii. (C), a compound with lowest number of C atoms and unsaturated hydrocarbon, shows both optical and geometrical isomerism. Following is the reaction sequence of A, B, and C. The structure of compound (C) is:

i. (A), a compound with lowest number of C atoms, is unsaturated hydrocarbon and is optically active. ii. (B), a compound with lowest number of C atoms, is unsaturated hydrocarbon and shows diastereomerism. iii. (C), a compound with lowest number of C atoms and unsaturated hydrocarbon, shows both optical and geometrical isomerism. Following is the reaction sequence of A, B, and C. The structure of compound (E) is:

i. (A), a compound with lowest number of C atoms, is unsaturated hydrocarbon and is optically active. ii. (B), a compound with lowest number of C atoms, is unsaturated hydrocarbon and shows diastereomerism. iii. (C), a compound with lowest number of C atoms and unsaturated hydrocarbon, shows both optical and geometrical isomerism. Following is the reaction sequence of A, B, and C. The structure of compound (F) is:

i. (A), a compound with lowest number of C atoms, is unsaturated hydrocarbon and is optically active. ii. (B), a compound with lowest number of C atoms, is unsaturated hydrocarbon and shows diastereomerism. iii. (C), a compound with lowest number of C atoms and unsaturated hydrocarbon, shows both optical and geometrical isomerism. Following is the reaction sequence of A, B, and C. The structure of compound (A) is:

ICSE-ORGANIC CHEMISTRY -QUESTIONS FOR PRACTICE
  1. Write the molecular formulae of the first two alkynes.

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  2. Alkynes are unsaturated hydrocarbons. Justify this statement giving tw...

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  3. Ethyne (C2H2) is unsaturated hydrocarbon. Explain.

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  4. What is the common name of ethyne (C2H2) ?

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  5. Write the general formula of alkynes.

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  6. What do n and 2n - 2 signify in the general formula of alkynes?

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  7. Write the number of H atoms in a molecule of alkyne if the number of C...

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  8. Write the molecular formula, electron dot structural formula and struc...

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  9. Write the IUPAC name of acetylene.

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  10. Ethyne undergoes addition reaction. State one reason.

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  11. Write the reaction of chlorine with ethyne in the presence of light

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  12. Write the reaction of chlorine with ethyne in the absence of light

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  13. Write the equation for the conversion of ethyne to ethane.

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  14. Name the property of ethyne which makes it useful for cutting and weld...

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  15. Write the equations for the reaction of ethyne with chlorine

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  16. Write the equations for the reaction of ethyne with bromine

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  17. Write the equations for the reaction of ethyne with hydrogen

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  18. How is ethyne converted to ethene

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  19. How is ethyne converted to ethane

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  20. How is ethyne converted to tetrabromoethane

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