Home
Class 11
CHEMISTRY
The stability of carbanions in the follo...

The stability of carbanions in the following
(i) `RC-=overset(-)overset(..)C` , (ii)
(iii) `R_(2)C=overset(-)overset(..)CH` , (iv) `R_(3)C-overset(-)overset(..)CH_(2)`
is in the order

A

`(ii) gt (iii) gt (iv) gt (i)`

B

`(iv) gt (ii) gt (iii) gt (i)`

C

`(i) gt (iii) gt (ii) gt (iv)`

D

`(i) gt(ii) gt (iii) gt (iv)`

Text Solution

Verified by Experts

The correct Answer is:
D
`RC-=overset(-)overset(..)C` is the most stable because `C` atom carrying the negative charge is `sp` hybridized (most electronegative `C`). Both (ii) and (iii) have negative charge on `sp^(2)` hybrized `C` atom but (iii) is less stable due to electron releasing alkyl groups. (iv) is the least stable as negative charge is carried by `sp^(3)` hybridized `C` atom.
Promotional Banner

Topper's Solved these Questions

Similar Questions

Explore conceptually related problems

The stability of carbanions in the following (i) RC-=overset(-"*")C (ii) (iii) R_2C=overset(-"*")(CH) (iv) R_3C-overset(-"*")(CH_2)

Arrange the following in order of their reactivity toward decarboxylation with sodalime (i) (ii) CH_(2)=CH-overset(O)overset(||)C-OH (iii) CH-=C-overset(O)overset(||)C-OH (iv) CH_(3)-CH_(2)-overset(O)overset(||)C-OH

The order of stability of the following tautomeric compounds is (i). CH_(2)=overset(OH)overset(|)(CH)-CH_(2)-overset(O)overset(||)(C)-CH_(3)hArr (ii). CH_(3)-overset(O)overset(||)(C)-CH_(2)-overset(O)overset(||)(C)-CH_(3)hArr (iii). CH_(3)-overset(OH)overset(|)(C)=CH-overset(O)overset(||)(C)-CH_(3)

CH_3-overset(OH)overset(|)(CH)-overset(O)overset(||)(C )-CH_2 - CH_(3) will respond to

Compare the stabilities of the following corbocation (a) overset(+)CH_(2) overset(..)(NH_(2)) " "(b) overset(+) CH_(2) - underset(..)overset(..)(OH) " "(c) overset(+) CH_(2) - underset(..) overset(..)F:

Compare the stability of the following free Radical. (a) CH_(3) - overset(.)CH_(2) " "(b)CH_(2) = overset(.)CH " "(c) CH = overset(.)CH

R SHARMA-GENERAL ORGANIC CHEMISTRY-Archives
  1. Arrange the following free radicals in the order of decreasing stabili...

    Text Solution

    |

  2. Base strength of the following (i) H(3)C CH(2)^(-) , (ii) H(2)C=CH^(...

    Text Solution

    |

  3. The stability of carbanions in the following (i) RC-=overset(-)overs...

    Text Solution

    |

  4. CH(3)CH(2)Cl undergoes homolytic fission to produce

    Text Solution

    |

  5. Hyperconjugation involves overlap of the following orbitals :

    Text Solution

    |

  6. Chlorination of methane in the presence of ultraviolet light involves:

    Text Solution

    |

  7. Which species are more resonance stabilized in the following pairs: ...

    Text Solution

    |

  8. The most stable carbocation is:

    Text Solution

    |

  9. Consider the following carbocation: (i) Cl(3)overset(+)C (ii) Cl(2...

    Text Solution

    |

  10. Which of the following compounds prossesses the C-H bonds with the low...

    Text Solution

    |

  11. Which of the following alkoxides is the most reactive nucleophile?

    Text Solution

    |

  12. :overset(-)CH(2)-underset( :O: )overset(C)(||)-CH(3) and CH(2)=underse...

    Text Solution

    |

  13. Resonance in most of the organic molecules

    Text Solution

    |

  14. Which of the following is the most stable?

    Text Solution

    |

  15. Polarization of electrons in acrolein may be written as:

    Text Solution

    |

  16. Nucleophilicity order is correctly represented by

    Text Solution

    |

  17. Among the following alkenes: {:(1-"Butene,",cis-2-"Butene",,"trans"-...

    Text Solution

    |

  18. Which of the following is an electrophile ?

    Text Solution

    |

  19. Which of the following is the active species in the nitration of aroma...

    Text Solution

    |

  20. Heterolytic fission of a covalent bond in organic molecules gives

    Text Solution

    |