CMC Medical CMC-Medical VELLORE Solved Paper-2007

  • question_answer 54) A simple method to remove peroxides from ethers is to treat them with an aqueous solution of

    A)  \[KI\]                                   

    B)  \[KCNS\]

    C)  \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}\]                              

    D)  \[B{{r}_{2}}\]

    Correct Answer: A

    Solution :

                    KI is added to old stocks of ethers when I is oxidised to \[{{I}_{2}}\] by ether peroxide which itself is reduced to ether\[2{{I}^{-}}\xrightarrow{{}}{{I}_{2}}+2{{e}^{-}}\]Ether peroxide\[+\,2{{e}^{-}}\xrightarrow{{}}\] ether\[+{{O}_{2}}\] In actual practice, the old stock of ether is repeatedly shaken with KI solution till it ceases to impart brown colour due to liberation of\[{{I}_{2}}\].

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