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Preparation of Alkyl Halides

Which of the ...

Question

Which of the following can be used to distinguish alkene from an alkane?

dil.

H_{2} S O_{4}

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B r_{2} - H_{2} O

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cold,dil.

K M n O_{4} / O H^{-}

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B r_{2}

-heat

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Solution

The correct options are
A dil. $H_{2} S O_{4}$
B cold,dil. $K M n O_{4} / O H^{-}$
C $B r_{2} - H_{2} O$
dil. $H_{2} S O_{4}$ absorbs alkene thus it can be used to distinguish between alkane and alkene,
Alkene dicolourise brown colour of $B r_{2} - H_{2} O$ solution and alkene decolourises the purple colour of cold, dil. alkaline $K M n O_{4}$ . Thus option A,B, and C are correct answer.

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