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9. Hydricarbon — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry9. Hydricarbon1 Mark
MCQ
Assertion : Benzene exhibit two different bond lengths, due to $C -C$ single and $C = C$ double bonds.

Reason : Actual structure of benzene is a hybrid of following two structures.

  • A
    If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  • B
    If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
  • ✓
    If the Assertion is correct but Reason is incorrect.
  • D
    If both the Assertion and Reason are incorrect.
✓

Answer

Correct option: C.
If the Assertion is correct but Reason is incorrect.
c
Benzene has a uniform $C -C$ bond distance of $139\, pm$ , a value intermediate between the $C -C$ single. $(154\, pm)$ and $C = C$ double $(134\, pm)$ bonds.
 

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