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Give reaction for the following : 'In a...

Give reaction for the following :
'In acylium ion, the structure `R-C -= O^(oplus)` is more stable than `R- overset(oplus) C=O`.

Text Solution

Verified by Experts

`R -overset(oplus) underset((I))C = ddotO: harrR - underset((II))C -= overset(oplus) O:`.
`(II)` is more stable because both `C` and `O` have an octet and there is one more convalent bond, although there is a positive charge on `EN O` atom. `(I)` is less stable because it has high energy because `C` has only six `overline e^, s`.
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Explain the following : (a) Why MeNH overset (oplus) CH_2 (I) is more stable more than MeCH_2 overset (oplus) CH_2 (II) when both are 1^@ carbocations ? (b) Which of the following intermediate is unstable ? ( c) Why allylic free radical (CH_2 - CH = CH_2) (I) is more stable than propy1 free radical (dot C H_2 - CH_2 - CH_3) (II) , when both are 1^@ free radicals ? (d) Arrange the following in the decreasing order of their stabilities : ( e) Which of the following resonance structures of p-nitro phenoxide is not feasible ? . (f) Which of the more stable carbocation ? .

Knowledge Check

  • Identify the carbocations lesser stable than CH_(3)-overset(oplus)(C)H_(2) :

    A
    `.^(oplus)CH_(3)` :
    B
    `underset(("Vinyl Carbocation"))(CH_(2)=overset(oplus)(CH))`
    C
    D

  • For the following reaction R - CN overset(H_(3)O^(+)) to R-COOH

    A
    there is protonation of electronegative nitrogen
    B
    an amide is formed as an intermediate
    C
    nitrogen atom is expelled as ammonia
    D
    all are correct

  • Find the more stable C^(oplus) ?

    A
    B
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