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Consider the following carbocations (I...

Consider the following carbocations
(I)`C_(6)H_(5)overset(+)CH_(2)` , (II)`C_(6)H_(5)CH_(2)overset(+)CH_(2)`
(III)`C_(6)H_(5)overset(+)CHCH_(3)` , (IV) `C_(6)H_(5)overset(+)C(CH_(3))_(2)`
The correct sequence for the stability of these is

A

`IIltIltIIIltIV`

B

`IIltIIIltIltIV`

C

`IIIltIltIIltIV`

D

`IVltIIIltIltII`

Text Solution

Verified by Experts

The correct Answer is:
A
IV is stabilised by +I effect of two `CH_(3)` groups and by dispersal of + ve charge on the benzene ring by resonance.
III is stabilized by + I effect of one `CH_(3)` group and by dispersal of + ve charge on the benzene ring.
I is stabilized by dispersal of +ve charge on the benzene ring.
II is not stabilized by any of the above factors `therefore `over all order of stability is `IIltIltIII ltIV` Hence (A) is correct.
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Arrange the following : (i) C_(6)H_(5)overset(*)(C)HCH_(3), C_(6)Hoverset(*)(C)HCH = CH_(2), C_(6)H_(5)CH_(2)overset(*)(C)H_(2), C_(6)H_(5)overset(*)(C)(CH_(3))_(2) in order of increasing stability. (ii) CH_(3)CH_(2)^(+), C_(6)H_(5)CH_(2)^(+), (CH_(3))_(3)C^(+), CH_(2) =CHCH_(2)^(+) in order of decreasing stability. (iii) HC -= C^(-), CH_(2) = CH^(-), CH_(3)CH_(2)^(-), CH_(3)^(-), (CH_(3))_(2)CH^(-), C_(6)H_(5)CH_(2)^(-) in order of increasing stability.

निम्नलिखित कार्बधनायनों पर विचार कीजिए, कार्बधनायनों के स्थायित्व का बढ़ता हुआ क्रम है (I) C_(6)H_(5)overset(+)(CH_(2))(II) C_(6) H_(5)CH_(2) overset(+)(CH_(2)) (III) C_(6)H_(5)overset(+)(CHCH_(3)) (IV) C_(6) H_(5) overset(+)( C) (CH_(3))_(2)

Knowledge Check

  • Consider the following carbocations : (I) C_(6)H_(5)overset(+)(C )H_(2) (II) C_(6)H_(5)CH_(2)overset(+)(C )H_(2) (III) C_(6)H_(5)overset(+)(C )HCH_(3) (IV) C_(6)H_(5)overset(+)(C )(CH_(3))_(2) The correct sequance of the stability of these is :

    A
    II < I < III < IV
    B
    II < III < I < IV
    C
    III < I < II < IV
    D
    IV < III < I < II

  • Consider the following carbocations (i) C_6H_5overset(+)CHC_6H_5 (ii) C_6H_5CH_2overset(+)CH_2 C_6H_5overset(+)CHCH_3 (iv) C_6H_5overset(+)(CH_3)_2 The correct sequence for the stability of these is

    A
    `II lt I III lt IV`
    B
    `II lt III lt I lt IV `
    C
    `III lt II lt IV`
    D
    `IV lt III lt I lt II`

  • Consider the following carbocation- (a). CH_(3)-overset(o+)(C)H_(2) (b). CH_(2)=overset(o+)(C)H (c). CH_(2)=CH-overset(o+)(C)H_(2) (d). C_(6)H_(5)-Coverset(o+)(H)_(2)

    A
    `dgtcgtagtb`
    B
    `dgtcgtbgta`
    C
    `cgtdgtbgta`
    D
    `cgtdgtagtb`

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