HydrocarbonsMedium
Question
Match List I with List II.
| List I (Molecule) | List II (Number and types of bond/s between two carbon atoms) |
|---|---|
| A. ethane | I. one $\sigma$-bond and two $\pi$-bonds |
| B. ethene | II. two $\pi$-bonds |
| C. carbon molecule, C2 | III. one $\sigma$-bond |
| D. ethyne | IV. one $\sigma$-bond and one $\pi$-bond |
Choose the correct answer from the options given below:
Options
A.A-III, B-IV, C-II, D-I
B.A-III, B-IV, C-I, D-II
C.A-I, B-IV, C-II, D-III
D.A-IV, B-III, C-II, D-I
Solution
Sol. [Key Concept: Sigma and pi bonding]
Ethane has one C–C σ bond (A–III); ethene has one σ and one π bond (B–IV); C₂ has two net π bonds in the NCERT molecular orbital description (C–II); ethyne has one σ and two π bonds (D–I). Thus, option (1) is correct. In C₂, the bonding and antibonding 2s σ contributions cancel, while four electrons occupy the two bonding π orbitals.
| List I (Molecule) | List II (Number and types of bond/s between two carbon atoms) |
|---|---|
| A. ethane | III. one $\sigma$-bond |
| B. ethene | IV. one $\sigma$-bond and one $\pi$-bond |
| C. carbon molecule, C2 | II. two $\pi$-bonds |
| D. ethyne | I. one $\sigma$-bond and two $\pi$-bonds |
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