Punjab Medical Punjab - MET Solved Paper-2007

  • question_answer Which reaction is not feasible?

    A) \[2Kl+B{{r}_{2}}\to 3KBr+{{I}_{2}}\]

    B) \[2KBr+{{I}_{2}}\to 2Kl+B{{r}_{2}}\]

    C) \[2KBr+C{{l}_{2}}\to 2KCl+B{{r}_{2}}\]

    D) \[2{{H}_{2}}O+2{{F}_{2}}\to 4HF+{{O}_{2}}\]

    Correct Answer: B

    Solution :

    \[2KBr+{{I}_{2}}\xrightarrow{{}}2KI+B{{r}_{2}}\]reaction is not possible because \[B{{r}^{-}}\] ion is not oxidised in \[B{{r}_{2}}\] with \[{{I}_{2}}\] due to higher electrode potential of \[{{I}_{2}}\] than bromine. In halogens fluorine can displace chlorine bromine and iodine, chlorine can displace bromine and iodine and bromide can displace iodine from their salts.

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