Question

The false statement regarding alkane is

• A. this does not perform polymerization reaction
• B. this does not gives elimination reaction
• C. it does not disappear the colour of dilute $ KMnO_4 $ solution
• D. it does not decolourise bromine water

Answer 1

Answer: (B)

Alkanes show elimination reactions. Higher alkanes eliminate hydrogen and lower alkanes on heating in the absence of air at $500-700^{\circ} C$.

$ \underset{\text{propane }}{ CH_3 — CH_2 —CH_3} \ce{->[600^\circ C]} CH_3 — \underset{\text{propene}}{CH} = CH_2 + \underset{\text{ethene }}{CH_2 = CH_2 }+\underset{\text{methane}}{CH_4 }+H_2$