The incorrect statement regarding ethyne is
Chemical Bonding · Class 11 · JEE Main Previous Year Question
The incorrect statement regarding ethyne is
- a
The C–C bond in ethyne is shorter than that in ethene
- b
Both carbons are sp hybridised
- c
Ethyne is linear
- d✓
The carbon–carbon bond in ethyne is weaker than that in ethene
The carbon–carbon bond in ethyne is weaker than that in ethene
🧠 In ethyne : both C are sp-hybridised, the molecule is linear, and the C≡C triple bond is shorter and stronger than C=C. Statement (d) reverses the strength comparison — that is the error.
| Statement | Correct? | |---|---| | (a) C–C bond shorter than in ethene | ✓ (triple bond length ~120 pm vs ~134 pm) | | (b) Both C are sp hybridised | ✓ | | (c) Ethyne is linear | ✓ | | (d) C–C bond weaker than in ethene | ✗ — triple bond (~835 kJ/mol) is stronger than double bond (~611 kJ/mol) |
⚠️ Trap: "more bonds = shorter = stronger" — all three properties move together. A shorter bond is always stronger (for bonds between the same pair of atoms).
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