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When alkyl groups are attached to an uns...

When alkyl groups are attached to an unsaturated system or a benzene nucleus, the sigma electrons present in `-underset(|)overset(|)(C )-H` bond of the alkyl group also involve in conjugation known as hyperconjugation

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The delocalisation of sigma electrons with P-orbital is known as Hyperconjugation. It is also known as sigma-pi conjugation 'or' No bond resonance. Presence of atleast one 'alpha' hydrogen at saturated carbon in an alkene, carbocation and free radical involves hyper conjucation. More is the no. of hyper conjugative structures more stable is the alkene. Bond lengths, dipolemoments are also effected by hyperconjugation. Hyper conjugation involves the

The delocalisation of sigma electrons with P-orbital is known as Hyperconjugation. It is also known as sigma-pi conjugation 'or' No bond resonance. Presence of atleast one 'alpha' hydrogen at saturated carbon in an alkene, carbocation and free radical involves hyper conjucation. More is the no. of hyper conjugative structures more stable is the alkene. Bond lengths, dipolemoments are also effected by hyperconjugation. Which of the following molecule has longest C = C bond length

The delocalisation of sigma electrons with P-orbital is known as Hyperconjugation. It is also known as sigma-pi conjugation 'or' No bond resonance. Presence of atleast one 'alpha' hydrogen at saturated carbon in an alkene, carbocation and free radical involves hyper conjucation. More is the no. of hyper conjugative structures more stable is the alkene. Bond lengths, dipolemoments are also effected by hyperconjugation. No bond resonance is not possible in

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. Which of the following carbocations will show highest number of Hyperconjugation forms?

Mesomerism is extended resonance. Atoms or groups with lone pairs of electrons release electrons when connected to doubly bonded carbons. It is +M effect. Unsaturated groups when connected to doubly bonded carbons withdraw pi electrons from the doubly bonded carbons. It is -M effect. Here the double bond is the unsaturated group should be between less electronegative atom and more electronegative atom. Mesomeric effect stabilizes or destabilizes the conjugate base of an acid. As a result the acid may be strong or weak has 4(OH) groups. Which -OH is a strong acid?

Mesomerism is extended resonance. Atoms or groups with lone pairs of electrons release electrons when connected to doubly bonded carbons. It is +M effect. Unsaturated groups when connected to doubly bonded carbons withdraw pi electrons from the doubly bonded carbons. It is -M effect. Here the double bond is the unsaturated group should be between less electronegative atom and more electronegative atom. Mesomeric effect stabilizes or destabilizes the conjugate base of an acid. As a result the acid may be strong or weak has 4(OH) groups. Which -OH is a strong acid?

AAKASH SERIES-GENERAL ORGANIC CHEMISTRY-Subjective Exercise -8
  1. The difference between the real energy of the resonance hybrid structu...

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  2. Resonance explains the stability of aromatic compounds, some unusual b...

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  3. When alkyl groups are attached to an unsaturated system or a benzene n...

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  4. Hyperconjugation is also called sigma-pi conjugation or no bond resoan...

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  5. Grater the number of methyl groups attached to the double bonded carbo...

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  6. Stability of alkenes, carbocations, alkyl free radicals, orienting eff...

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  7. Homolytic fission of a covalent bond leads to the formation of neutral...

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  8. Homolytic fission is favoured by conditions such as non-polar nature o...

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  9. Heterolytic fission of a covalent bond leads to the formation of charg...

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  10. The Hetrolytic fission will be favoured by polar nature of the bond, ...

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  11. Carbocation is a group of atoms that contains a carbon atom bearing po...

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  12. The positively charged carbon atom in the carbocation is in sp^(2) hyb...

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  13. Order of stability of carbocations is: R(3)C^(+) gt R(2)overset(+)C H ...

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  14. The stability order can be explained by hyper conjugation and also by ...

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  15. Carbanion is a group of atoms that contains a carbon atom bearing nega...

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  16. The negatively charged carbon atom in the carbanion is in sp^(3) hybri...

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  17. The stability order of carbanions is: CH(3)^(-) gt CH(3)CH(2)^(-) gt (...

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  18. If an unpaired electron is present on a carbon atom in a group of atom...

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  19. Alkyl free radicals are planar and the central carbon atom is in sp^(2...

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  20. The unhybridised 2p orbitals of the central carbon atom of alkyl free ...

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