Alcohols can be distinguished from alkenes by

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(B) Alkenes react with bromine in $CCl_4$ to undergo electrophilic addition,resulting in the decolourisation of the reddish-brown bromine solution. $C

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Decolourizing with bromine in $CCl_4$

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(B) Alkenes react with bromine in $CCl_4$ to undergo electrophilic addition,resulting in the decolourisation of the reddish-brown bromine solution. $CH_2=CH_2 + Br_2/CCl_4 \rightarrow CH_2Br-CH_2Br$ (colourless). Alcohols do not react with bromine in $CCl_4$ under these conditions. Therefore,decolourising with bromine in $CCl_4$ is a standard test to distinguish alkenes from alcohols.

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