Exams › JEE Main › Chemistry
In which of the following species are the C-C single bond and C=C double bond lengths NOT equal (i.e., bond lengths are unequal)?
- Benzene
- 1,3-butadiene
- 1,3-cyclohexadiene
- Graphite
Correct answer: 1,3-butadiene
Solution
Benzene and graphite have fully delocalized pi systems making all C-C bonds equal in length. 1,3-butadiene is an open-chain conjugated diene with distinct single (about 1.47 A) and double (about 1.34 A) bonds, so its bond lengths are unequal.
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 →