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Haloalkanes and Haloarenes — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryHaloalkanes and Haloarenes1 Mark
MCQ
Alkyl halides develop colour on:
  • A
    Addition of water
  • B
    Addition of non polar solvent
  • ✓
    Exposure to light
  • D
    Exposure to air
✓

Answer

Correct option: C.
Exposure to light
Alkyl bromides and iodides develop colour when exposed to light. Halogens have lower bond dissociation energy. This low enthalpy means that even at normal temperature or on exposure to sunlight, they decompose and form free ions, which are coloured and hence impart colour on exposure to light.

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