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Hyperconjugation is best described as:...

Hyperconjugation is best described as:

A

Delocalisation of `pi` electrons into a nearby empty orbital.

B

Delocalisation of `sigma` electrons into a nearby empty orbital.

C

The effect of alkyl groups donating a small amount of electron density inductively into a carbocation.

D

The migration of a carbon or hydrogen from one carbocation to another.

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The correct Answer is:
B
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Hyperconjugation describes the orbital interactions between the p-systems and the adjacent s-bond of the substituent group(s) in organic compounds. Hyperconjugation is also called as Baker and Nathen effect. The necessary and sufficient condition for the hyperconjugation are : i) Compound should have at least on sp2 hybrid carbon of either alkene, carbocation or alkyl free radical. ii) A-carbon with respect to sp2 hybrid carbon should have at least one hydrogen. Hyperconjugation are of three types: (i) s(C-H), p-conjugation. (iii) s(C-H), positive charge conjugation iv) s(C-H), odd electron conjugation The hyperconjugation may be represented as Number of resonating structures due to hyperconjugation = (n + 1) where n is the number of a-hydrogen. Greater is the number of such forms, more is the stability of the species under considersation. Which of the following carbocations will show highest number of Hyperconjugation forms?

Hyperconjugation describes the orbital interactions between the p-systems and the adjacent s-bond of the substituent group(s) in organic compounds. Hyperconjugation is also called as Baker and Nathen effect. The necessary and sufficient condition for the hyperconjugation are : i) Compound should have at least on sp2 hybrid carbon of either alkene, carbocation or alkyl free radical. ii) A-carbon with respect to sp2 hybrid carbon should have at least one hydrogen. Hyperconjugation are of three types: (i) s(C-H), p-conjugation. (iii) s(C-H), positive charge conjugation iv) s(C-H), odd electron conjugation The hyperconjugation may be represented as Number of resonating structures due to hyperconjugation = (n + 1) where n is the number of a-hydrogen. Greater is the number of such forms, more is the stability of the species under considersation. Hyperconjugation is possible in which of the following species ?

Hyperconjugation describes the orbital interactions between the p-systems and the adjacent s-bond of the substituent group(s) in organic compounds. Hyperconjugation is also called as Baker and Nathen effect. The necessary and sufficient condition for the hyperconjugation are : i) Compound should have at least on sp2 hybrid carbon of either alkene, carbocation or alkyl free radical. ii) A-carbon with respect to sp2 hybrid carbon should have at least one hydrogen. Hyperconjugation are of three types: (i) s(C-H), p-conjugation. (iii) s(C-H), positive charge conjugation iv) s(C-H), odd electron conjugation The hyperconjugation may be represented as Number of resonating structures due to hyperconjugation = (n + 1) where n is the number of a-hydrogen. Greater is the number of such forms, more is the stability of the species under considersation. Which of the following carbocations will show highest number of Hyperconjugation forms?

Hyperconjugation describes the orbital interactions between the p-systems and the adjacent s-bond of the substituent group(s) in organic compounds. Hyperconjugation is also called as Baker and Nathen effect. The necessary and sufficient condition for the hyperconjugation are : i) Compound should have at least on sp2 hybrid carbon of either alkene, carbocation or alkyl free radical. ii) A-carbon with respect to sp2 hybrid carbon should have at least one hydrogen. Hyperconjugation are of three types: (i) s(C-H), p-conjugation. (iii) s(C-H), positive charge conjugation iv) s(C-H), odd electron conjugation The hyperconjugation may be represented as Number of resonating structures due to hyperconjugation = (n + 1) where n is the number of a-hydrogen. Greater is the number of such forms, more is the stability of the species under considersation. Stability of saturated alkyl carbocations can be explained by

Hyperconjugation is also called sigma-pi conjugation or no bond resoance

Hyperconjugation effect is also termed as 'no bond resonance'. Why?

AAKASH SERIES-ELECTRONIC EFFECTS AND REACTION INTERMEDIATES-ADDITIONAL PRACTICE EXERCISE (LEVEL - II LECTURE SHEET (ADVANCED) Straight ObjectiveType Questions)
  1. Which one of the following is least basic in character?

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  2. Select the least basic compound.

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  3. Basicity order of N in the following compound is :

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  4. Consider the following base (I) o-nitroaniline" " (II) m-nitroanil...

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  5. Select the most basic compound.

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  6. Which one of the following molecules has all the effects, namely induc...

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  7. Hyperconjugation is best described as:

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  8. Select the correct statement. (i) Delocalisation of sigma-electron i...

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  9. Arrange the following compounds in decreasing order of electrophilic s...

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  10. Resonance energy of benzene is

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  11. In which of the following pairs IInd compound has higher resonance ene...

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  12. In which of the following pairs IInd compound has less resonance energ...

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  13. Identify electron - withdrawing groups in resonance among the followin...

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  14. Which of the following groups can neither donate a pair of electrons i...

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  15. Which of the following group can participate in resonance with other s...

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  16. Which one of the following pairs of structures represent the phenomeno...

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  17. In which of the following pairs IInd compound has less resonance energ...

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  18. In which of the following is (are) the correct order of bond lengths :

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  19. Select the correct statement about product A.

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  20. Which of the following compounds is aromatic?

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