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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:

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