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Why does pure HCN fail to react with ald...

Why does pure HCN fail to react with aldehydes and ketones ?

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HCN is mainly a covalent compound and can not provides `CN^(-)` ion readily for the nucleophilic attack on the carbonyl compound. The reaction is carried in the presence of base which helps in the ionisation of the acid to liberate `CN^(-)` ion.
`HCN + OH^(-) rarr H_(2)O + CN^(-)`
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Knowledge Check

  • This question has Statement I and Statement II. Of the four choices given after the Statements, choose the one that best describes the two Statements Statement -1: Grignard reagent reacts with aldehydes and ketones to form alcohols. Statement-II:Alcohols have acidic hydrogen

    A
    Statement-I is true, Statement-II is true, Statement-II is a correct explanation of Statement-I
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    Statement -I is true, Statement-II is true, Statement-II is not a correct explanation of Statement-I.
    C
    Statement-I is true, Statement -II is false.
    D
    Statement -1 is false, Statement-II is true.

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