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Topic: Valence bond theory, hybridization (s, p, d), resonance· Chemical Bonding and Molecular Structure

Match List I with List II.List I (Molecule): A. ethane B. ethene C. carbon molecule, C_2 D. ethyneList II (Number and types of bond/s between two carbon atoms): I. one σ-bond and two π-bonds II. two π-bonds III. one σ-bond IV. one σ-bond and one π-bo…

Match List I with List II.

List I (Molecule): A. ethane B. ethene C. carbon molecule, \(C_2\) D. ethyne

List II (Number and types of bond/s between two carbon atoms): I. one \(\sigma\)-bond and two \(\pi\)-bonds II. two \(\pi\)-bonds III. one \(\sigma\)-bond IV. one \(\sigma\)-bond and one \(\pi\)-bond

Choose the correct answer from the options given below:

1. A-III, B-IV, C-I, D-II

2. A-I, B-IV, C-II, D-III

3. A-IV, B-III, C-II, D-I

4. A-III, B-IV, C-II, D-I

1 answer

Best answer

Answer: 4. A-III, B-IV, C-II, D-I

Key idea: count the bond between the two carbons.

  • Ethane \(\mathrm{H_3C-CH_3}\): one \(\sigma\) bond (III).
  • Ethene: one \(\sigma\) + one \(\pi\) (IV).
  • \(\mathrm{C_2}\) molecule: by molecular orbital theory both bonds are \(\pi\) bonds (II).
  • Ethyne: one \(\sigma\) + two \(\pi\) (I).

A-III, B-IV, C-II, D-I: option 4.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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