SCIENCE
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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I and II only
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I and III only
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II and III only
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I, II and III
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Detailed explanation-1: -Q. What happens when a few drops of bromine water are added to excess hex-1-ene and the mixture is shaken? I. The colour of the bromine water disappears.
Detailed explanation-2: -Both hexene and hexyne react immediately with bromine, and decolorize it, because the addition products, dibromohexane and tetrabromohexane, are colorless. If the unknown hydrocarbon is unsaturated, as each drop of the brown bromine solution is added its color will fade and the hydrocarbon solution will remain clear.
Detailed explanation-3: -there is no change when bromine water is mixed with an alkane. the bromine water becomes colourless when it is mixed with an alkene.
Detailed explanation-4: -Bromine water is an orange solution of bromine. It becomes colourless when it is shaken with an alkene.