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Hyperconjugation describes the orbital i...

Hyperconjugation describes the orbital interactions between the `pi`-system and the adjacent `sigma`-bond of the substituent group(s) in organic compounds. Hyperconjugation is called as Baker and Nathan effect. The necessary and sufficient conditions for the hyperconjugation are:
(i) Compound should have at least one `sp^(2)`-hybrid carbon of either alkene, carbocation or alkyl free radical.
(ii) `alpha`-carbon with respect to `sp^(2)` -hybrid carbon should have at least one hydrogen.
Hyperconjugation are of three types:
(i) `sigma(C-H),pi`-conjugation,
(ii) `sigma(C-H),` positive charge conjugation,
(iii) `sigma(C-H)`, odd electron conjugation.
The hyperconjugation may be represented as,


Number of resonating structures due to hyperconjugation `=(n+1)`, where n is the numebr of `alpha`-hydrogen. Greater is the number of such forms, more is the stability of the species under consideration.
Hyperconjugation is possible in which of the following species?

A

`CH_(3)-CH_(2)-`

B

`C_(6)H_(5)-CH_(3)`

C

`H_(2)C=CH_(2)`

D

`CH_(3)-overset(CH_(3))overset("| ")underset(CH_(3))underset("| ")"C "-CH=CH_(2)`

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Hyperconjugation describes the orbital interactions between the pi -system and the adjacent sigma -bond of the substituent group(s) in organic compounds. Hyperconjugation is called as Baker and Nathan effect. The necessary and sufficient conditions for the hyperconjugation are: (i) Compound should have at least one sp^(2) -hybrid carbon of either alkene, carbocation or alkyl free radical. (ii) alpha -carbon with respect to sp^(2) -hybrid carbon should have at least one hydrogen. Hyperconjugation are of three types: (i) sigma(C-H),pi -conjugation, (ii) sigma(C-H), positive charge conjugation, (iii) sigma(C-H) , odd electron conjugation. The hyperconjugation may be represented as, Number of resonating structures due to hyperconjugation =(n+1) , where n is the numebr of alpha -hydrogen. Greater is the number of such forms, more is the stability of the species under consideration. Stability of alkyl carbocations can be explained by

Hyperconjugation describes the orbital interactions between the pi -system and the adjacent sigma -bond of the substituent group(s) in organic compounds. Hyperconjugation is called as Baker and Nathan effect. The necessary and sufficient conditions for the hyperconjugation are: (i) Compound should have at least one sp^(2) -hybrid carbon of either alkene, carbocation or alkyl free radical. (ii) alpha -carbon with respect to sp^(2) -hybrid carbon should have at least one hydrogen. Hyperconjugation are of three types: (i) sigma(C-H),pi -conjugation, (ii) sigma(C-H), positive charge conjugation, (iii) sigma(C-H) , odd electron conjugation. The hyperconjugation may be represented as, Number of resonating structures due to hyperconjugation =(n+1) , where n is the numebr of alpha -hydrogen. Greater is the number of such forms, more is the stability of the species under consideration. Which of the following carbocations will show highest number of hyperconjugative forms?

Hyperconjugation describes the orbital interactions between the pi -system and the adjacent sigma -bond of the substituent group(s) in organic compounds. Hyperconjugation is called as Baker and Nathan effect. The necessary and sufficient conditions for the hyperconjugation are: (i) Compound should have at least one sp^(2) -hybrid carbon of either alkene, carbocation or alkyl free radical. (ii) alpha -carbon with respect to sp^(2) -hybrid carbon should have at least one hydrogen. Hyperconjugation are of three types: (i) sigma(C-H),pi -conjugation, (ii) sigma(C-H), positive charge conjugation, (iii) sigma(C-H) , odd electron conjugation. The hyperconjugation may be represented as, Number of resonating structures due to hyperconjugation =(n+1) , where n is the numebr of alpha -hydrogen. Greater is the number of such forms, more is the stability of the species under consideration. Which of the following alkenes will show maximum number of hyperconjugation forms?

Hyperconjugation describes the orbital interactions between the pi -system and the adjacent sigma -bond of the substituent group(s) in organic compounds. Hyperconjugation is called as Baker and Nathan effect. The necessary and sufficient conditions for the hyperconjugation are: (i) Compound should have at least one sp^(2) -hybrid carbon of either alkene, carbocation or alkyl free radical. (ii) alpha -carbon with respect to sp^(2) -hybrid carbon should have at least one hydrogen. Hyperconjugation are of three types: (i) sigma(C-H),pi -conjugation, (ii) sigma(C-H), positive charge conjugation, (iii) sigma(C-H) , odd electron conjugation. The hyperconjugation may be represented as, Number of resonating structures due to hyperconjugation =(n+1) , where n is the numebr of alpha -hydrogen. Greater is the number of such forms, more is the stability of the species under consideration. Which of the following free redicals will not show the phenomena of hyperconjugation?

When (C-H)sigma electrons are in conjugation to pi bond this conjugation is known as hyperconjugation. For any compound to show hyperconjugation : (i) Compound should have one sp^(2)-hybridised carbon. (ii) alpha-carbon with respect to sp^(2) should be sp^(3) (iii) alpha-corbon should contain at least one hydrogen atom. Which of following cations is hyperconjugation destabilized?

Hyperconjugation || Conditions for Hyperconjugation

When (C-H)sigma electrons are in conjugation to pi bond this conjugation is known as hyperconjugation. For any compound to show hyperconjugation : (i) Compound should have one sp^(2)-hybridised carbon. (ii) alpha-carbon with respect to sp^(2) should be sp^(3) (iii) alpha-corbon should contain at least one hydrogen atom. Which of following alkenes is most stabilized?

When (C-H)sigma electrons are in conjugation to pi bond this conjugation is known as hyperconjugation. For any compound to show hyperconjugation : (i) Compound should have one sp^(2)-hybridised carbon. (ii) alpha-carbon with respect to sp^(2) should be sp^(3) (iii) alpha-corbon should contain at least one hydrogen atom. Which of following alkyl benzene has maximum electron density?

Number of sp^2 hybrid carbon atoms in aspartame is

Knowledge Check

  • When (C-H)sigma electrons are in conjugation to pi bond this conjugation is known as hyperconjugation. For any compound to show hyperconjugation : (i) Compound should have one sp^(2)-hybridised carbon. (ii) alpha-carbon with respect to sp^(2) should be sp^(3) (iii) alpha-corbon should contain at least one hydrogen atom. Which of following cations is hyperconjugation destabilized?

    A
    `CH_(3)-overset(o+)CH_(2)`
    B
    `CH_(3)-underset(CH_(3))underset(|)overset(o+)CH`
    C
    `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)overset(o+)C`
    D

  • When (C-H)sigma electrons are in conjugation to pi bond this conjugation is known as hyperconjugation. For any compound to show hyperconjugation : (i) Compound should have one sp^(2)-hybridised carbon. (ii) alpha-carbon with respect to sp^(2) should be sp^(3) (iii) alpha-corbon should contain at least one hydrogen atom. Which of following alkenes is most stabilized?

    A
    `CH_(2)=CH_(2)`
    B
    C
    D

  • When (C-H)sigma electrons are in conjugation to pi bond this conjugation is known as hyperconjugation. For any compound to show hyperconjugation : (i) Compound should have one sp^(2)-hybridised carbon. (ii) alpha-carbon with respect to sp^(2) should be sp^(3) (iii) alpha-corbon should contain at least one hydrogen atom. Which of following alkyl benzene has maximum electron density?

    A
    B
    C
    D