Exams › JEE Main › Chemistry
Arrange the following in the correct decreasing order of C-C bond length (C6H6 = benzene).
- C2H6 > C2H4 > C6H6 > C2H2
- C2H6 > C6H6 > C2H4 > C2H2
- C2H4 > C2H6 > C2H2 > C6H6
- C2H6 > C2H4 > C2H2 > C6H6
Correct answer: C2H6 > C6H6 > C2H4 > C2H2
Solution
Bond lengths: C2H6 single bond ~1.54 A; benzene ~1.39 A (bond order 1.5); C2H4 double bond ~1.34 A; C2H2 triple bond ~1.20 A. Higher bond order gives shorter, stronger bonds. So the order is C2H6 > C6H6 > C2H4 > C2H2.
Related JEE Main Chemistry questions
- Although the electronegativity gap between N and F is larger than that between N and H, ammonia has a dipole moment of 1.5 D while nitrogen trifluoride has only 0.2 D. The reason is that
- When N₂ is converted into N₂⁺, the dissociation energy of the N–N bond ______, and when O₂ is converted into O₂⁺, the dissociation energy of the O–O bond ______.
- From the ions listed below, which pair has geometries that can be accounted for by the same type of orbital hybridization? NO₂⁻, NO₃⁻, NH₂⁻, NH₄⁺, SCN⁻
- Atoms A and B have electronegativities of 1.20 and 4.0, respectively. What is the percentage ionic character of the A–B bond?
- In the phosphate ion, PO₄³⁻, what is the formal charge on an oxygen atom that is singly bonded to phosphorus in a P–O bond?
- Among the following species, which one has no unpaired electrons?
⚔️ Practice JEE Main Chemistry free + battle 1v1 →