How yo differentiate between an alkane and alkene chemically

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Solution

Distinguish between alkane and alkene by chemical method:
Sr. No. Test Alkane ( CH₃-CH₃) Alkene (CH₂=CH₂)
1. Bromine water test Reddish-brown colour retained Reddish-brown colour discharged
2. Cold aqueous KMnO₄ test Purple colour of KMnO₄retained Purple colour of KMnO₄ discharged

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Write the molecular formula of (i) an alkane (ii) an alkene, and (iii) an alkyne, each having 20 carbon atoms.

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Sr. No.	Test	Alkane ( CH₃-CH₃)	Alkene (CH₂=CH₂)
1.	Bromine water test	Reddish-brown colour retained	Reddish-brown colour discharged
2.	Cold aqueous KMnO₄ test	Purple colour of KMnO₄retained	Purple colour of KMnO₄ discharged