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Arrange the following resonating structu...

Arrange the following resonating structures in order of increasing stability
`underset((I))(CH_(2)=overset(+)(N)=overset(-)(N))" "underset((II))(H_(2)overset(+)(C)=N=overset(-)(N))" "underset((III))(H_(2)overset(-)(C)-overset(+)(N) equiv N)" "underset((IV))(H_(2) overset(-)(C)-N=overset(+)(N))`

Text Solution

Verified by Experts

The correct order of increasing stability is : `(I) gt (III) gt (II) gt (IV)`
`*" "`Structure `(I)` is maximum stable because conjugation is maintained.
`*" "`Structure `(IV)` is least stable because electronegative carbon atom has negative charge.
`*" "` Out of structures `(II)` and `(III)`, the structure `(III)` is more stable because of the presence of triple bond between the two nitrogen atoms.
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Arrange the following resonating structures in the order of decreasing stability : (a) underset(("Vinyl chloride"))underset((I))(CH_(2)=CH-ddotunderset(..)CI: )harrunderset((II))( :overset(Theta)(CH_(2))-CH=overset(o+)underset(..)CI: )harrunderset((III))(overset(o+)CH_(2))-CH=underset(..)ddotCI^(Theta) b. underset(("Formic acid"))underset((IV))(H-overset(ddotO: )overset(||)C)-underset(..)ddotOH harrunderset((V))(H-overset( :ddotO:^(Theta))overset(|)(C)=underset(o+)ddotO)-H harrunderset((VI))(H-overset( :ddotO:^(Theta))overset(|)underset(o+)(C)-underset(..)ddotO-Hharr) underset((VII))(H-underset(ddotTheta)overset( overset(o+):O: )overset(|)C-underset(..)ddotO-H) ( c) Write the resonating structure of phenol in order of decreasing stability.

For the given four structures , I to IV, which of the following is correct ? underset((I))(C_(2)H_(5)-overset(CH_(3))overset(|)(C)H-C_(3)H_(7)) underset((II))(CH_(3)-overset(O)overset(P)(C)-overset(CH_(3))overset(|)(C)H-C_(2)H_(5)) underset((III))(CH_(3)-overset(O)overset(P)(C ) -overset(C_(2)H_(5))overset(|)(C ) H -C_(2)H_(5)) underset((IV))(C_(2)H_(5)-overset(CH_(3))overset(|)(C)H-C_(2)H_(5))

Knowledge Check

  • The correct stability order of the following resonating structure is : underset("(I)")(H_(2)C=overset(+)N=overset(-)N)" "underset("(II)")(H_(2)overset(+)C-N=overset(-)N)" "underset("(III)")(H_(2)overset(-)C-overset(+)N-=N)" "underset("(IV)")(H_(2)overset(-)C-N=overset(+)N)

    A
    `(I)gt(II)gt(IV)gt(III)`
    B
    `(I)gt(III)gt(II)gt(IV)`
    C
    `(II)gt(I)gt(III)gt(IV)`
    D
    `(III)gt(I)gt(IV)gt(II)`

  • The correct stability order of the following resonanating structures is : underset("(I)")(CH_(2)=C=O)" "underset("(II)")(C_(3)overset(-)C-overset(+)C=O)" "underset("(III)")(H_(2)C=overset(+)C-overset(-)O)" "underset("(IV)")(H_(2)overset(-)C-C-=overset(+)O)

    A
    `(IV)gt(I)gt(III)gt(II)`
    B
    `(II)gt(IV)gt(I)gt(III)`
    C
    `(III)gt(II)gt(IV)gt(I)`
    D
    `(I)gt(IV)gt(III)gt(II)`

  • For hydrazoic acid, which of the following resonating structure well be least stable? underset("(I)")(H-N=overset(+)N=overset(-)N)harrunderset(" (II)")(H-overset(+)N-overset(+)N=N^(2-))harrunderset("(III)")(H-overset(-)N-overset(+)N-=N)

    A
    I
    B
    II
    C
    III
    D
    Both (I) and (III)

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    Explore conceptually related problems

    Which resonance form in each of the following sets is the major contributor to the real structure? (i) underset((a))(H_(2)C=CH-ddotunderset(..)CI: )harr underset((b))(H_(2)overset(-)overset(ddot)(C)-CH=overset(-+)underset(..)CI: )harrunderset((c))(H_(2)overset(+)(C)-CH=overset(ddot)underset(..)CI:^(-)) (ii) underset((a))(H_(2)overset(-)(C)-CH=overset(+)(N)H_(2)) harr underset((b))(H_(2)=CH-overset(ddot)(N)H_(2))

    With proper reasoning, arrange the following resonance structures in order of decreasing stability. I. H_(2)C = overset(+)(N)=N^(-) II. H_(2)overset(+)(C)-N = N^(-) III. H_(2)C^(-) - overset(+)(N) -= N IV. H_(2)C^(-) - N = N^(+)

    Arrange the following carbonium ions in order of decreasing stability : underset(I)underset()((CH_(3))_(3)overset(+)C)" "underset(II)underset()((CH_(3))_(2)overset(+)CH)" "underset(III)underset()(CH_(3)overset(+)CH_(2))" "underset(IV)underset()(overset(+)H_(3)C)

    The correct stability order of the following resonance structures is (I)H_(2)C = overset(+)N = overset(-)N" "(II)H_(2)overset(+)C - N = overset(-)N (III)H_(2)overset(-)C - overset(+)N = N" "(IV)H_(2)overset(-)C - N = overset(+)N

    The decreasing order of stability of the following cations is underset(I)(CH_(3)overset(+)(C)H_(2)) , underset(II)(H_(2)C=overset(+)(C)H) , underset(III)(H-C-=overset(+)(C)) , underset(IV)(H_(3)C-overset(+)(C)=0)

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