unsaturated compounds decolourise bromine water as bromine is added to them.bromine is a halogen and saturated compounds undergo sustitution reaction with halogens,then why does saturated compounds do not decolourise bromine water as bromine will substitute hydrogen in this case also?

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Solution

1. The substitution reaction of halogens like bromine to saturated alkanes requires high amount of sunlight and also the a series of products is formed.
2. The reaction is also very time consuming. Thus in saturated alkane,,we do not observe decolorisation of bromine water.

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One of the following organic compounds cannot decolourise the red-brown colour of bromine water. This compound is :

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