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Consider the following carbocations, ...

Consider the following carbocations,
`undersetI((CH_3)_3C overset+CH_2), underset(II)((CH_3)_3C^(+)), CH_(3)underset(III)CH_(2)overset(+)CH_(2), CH_(3)underset(IV)overset(+)CH-CH_(3)`
The correct order for the stability of the above carbocations is

A

`IltIIIltIVltII`

B

`IIIltIVltIltII`

C

`IVltIIIltIIltI`

D

`IIltIVltIIIltI`

Text Solution

Verified by Experts

The correct Answer is:
A
Larger the number of `alpha-H` atoms linked toa carbocation, more will be stable carbocation. On the basis of hyperconjugation, the correct order of stability is `I lt III lt IV lt II`
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Consider the following carbocations I overset(+)underset((CH_(3))_(3)C CH_(2) II (CH_(3))_(3)C^(+) III {:(" " +),(CH_(3)CH_(2)CH_(2)):} IV {:(" " +),(CH_(3)-CH-CH_(3)):} The correct order for the stability of the above carbocations is

The order of stability of the following carbocations underset((I))(CH_(2)=overset(+)(C)H-CH_(2)) , underset((II))(CH_(3)-CH_(2)-overset(+)(C )H_(2))

CH_(3)-underset(CH_(3))underset(|)(CH)-CH=CH-CH_(2)-overset(O)overset(||)(C)-OH

CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH_(2)-underset(O)underset(||)(C)-NHCH_(3)

The order of stability of the following carbocations: underset("I")(CH_(2)C=CH-overset(o+)CH_(2))" , "underset("II")(CH_(3)-CH_(2)-overset(o+)CH_(2))" , "underset("III")(C_(6)H_(5)-overset(o+)CH_(2))

CH_(3)-underset(CH_(3))underset(|)(C)=CH-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-CH_(3)

In following compound CH_(3)-CH_(2)-underset(CH_(3))overset(CH_(3))underset|overset(|)(C)-underset(CH_(3))underset(|)(CH)-overset(CH_(3))overset(|)(CH)-CH_(2)-CH_(3) The correct lowest set of locant is :

CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-CH=CH_(2)+HBr to A The structure of A is:

Arrange the following according to increasing stability: underset((I))(CH_(3)CH_(2)CH_(2)overset(+)(CH_(2))) , underset((II))((CH_(3))_(3)overset(+)(C)) , underset((III))(CH_(3),CH_(3)CH_(2)overset(+)(CH_(3)))

MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-BASIC PRINCIPLES AND TECHNIQUES IN ORGANIC CHEMISTRY-EXERCISE 2
  1. Consider the following carbocations, undersetI((CH3)3C overset+CH2)...

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  2. When CH(3)Cl undergoes homolytic bond-fission

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  3. Which one of the following C-H bonds is the wekest for homolytic fissi...

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  4. In which of the following ways does the hydride ion tend to function ?

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  5. Most stable radical is

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  6. Select the incorrect statement .

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  7. Dehydrobromination (-HBr) of the following in increasing order is

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  8. The structural formula of 2-oxo-3-methyl-(N-bromo) butanamide is

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  9. Indicate the wrongly named compound

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  10. The most stable carbanion is

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  11. The most stable free radical among the following is

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  12. CH(3) overset(*) H(2) disproportionates to

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  13. Additionof HCI to 3,3 dimethyl but-1-ene yields two products, one of w...

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  14. Basic strength of CH-=overset(Theta)C(l), CH(2)=overset(Theta) CH(II) ...

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  15. Electrophile overset(o+)(NO(2)) attacks the following In which ca...

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  16. Major organic product fomred from the following sequence of reactions ...

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  17. Among the following, which is least acidic ?

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  18. In which of the following compounds, does the substituent not exert it...

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  19. When acidified sodium extract of organic compound is treated with acet...

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  20. The formation of yellow precipitate by the addition of solution of amm...

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  21. In Carius tube, the compound ClCH(2)COOH was heated with fuming HNO(3)...

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