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Hydrocarbons — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryHydrocarbons1 Mark
MCQ
Although benzene is highly unsaturated it does not undergo addition reactions. The explanation of this can be suggested as :
  • ✓
    $\pi-$ electrons of benzene ring are delocalised.
  • B
    Since $\pi-$ electrons are present inside the ring, addition cannot take place.
  • C
    Cyclic structures do not show addition reactions
  • D
    Benzene is not a reactive compound.
✓

Answer

Correct option: A.
$\pi-$ electrons of benzene ring are delocalised.
$\pi-$ electrons of the benzene ring are delocalised.
There are delocalised $\pi -$ electrons above and below the plane of the ring. The presence of the delocalised $\pi-$ electrons makes benzene particularly stable.
Benzene resists addition reactions because that would involve breaking the delocalisation and losing that stability.

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