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Q. Which of the following compounds decolourises aqueous bromine and does not gives white fumesof HCI on reaction with $PCI_5$ ?

Alcohols Phenols and Ethers

Solution:

$CH _{3}- CH = CH - CH _{2}- CH _{2}- OH + PCl _{5} \rightarrow K _{3} C - CH = CH - CH _{2}- CH _{2}- Cl + MCl + POCl _{3} \downarrow Br _{2} \mid H _{2} O$ Colour decolorises due to the presence of double bond.