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Haloalkanes and Haloarenes — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryHaloalkanes and Haloarenes1 Mark
MCQ
The false statement regarding alkane is:
  • A
    This does not perform polymerization reaction.
  • ✓
    This does not gives elimination reaction.
  • C
    It does not disappear the colour of dilute $\mathrm{KMnO}_4$​ solution.
  • D
    It does not decolourise bromine water.
✓

Answer

Correct option: B.
This does not gives elimination reaction.
Alkanes show elimination reactions. Higher alkanes eliminate hydrogen and give lower alkanes and alkenes on heating in the absence of air at high temperatures.
$\mathrm{R}-\mathrm{CH}_2-\mathrm{CH}_3 \rightarrow \mathrm{R}-\mathrm{CH}=\mathrm{CH}_2$​

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