what is hyperconjugation effect? how it explain the stability of alkenes

what is hyperconjugation effect? how it explain the stability of alkenes


7 Answers

Durgesh Prasher
21 Points
11 years ago

1242_25758_double bond.jpeg

vikas askiitian expert
509 Points
11 years ago

When atoms / groups having lone pair of electrons are bonded by a single bond to the conjugated system, they displace electrons towards multiple bonds.

illustration of hyperconjugation with single bond
  • When electronegative atoms or group of atoms bond themselves to the conjugated systems by multiple bonding they pull electrons from the multiple bond.
  • illustration of hyperconjugation with multiple bond

This conjugation between electrons of single (H-C) bond with multiple bonds is called hyperconjugation. This occurs when the sigma (s) electrons of the H-C bond that is attached to an unsaturated system, such as double bond or a benzene ring, enter into conjugation with the unsaturated system.

Stability order of alkenes

11 Points
5 years ago
If sigma electrons containing acidic H are present at alternate position with πelectron system, then sigma electrons enter into conjugation with π electron system
pragati dound
21 Points
5 years ago
Hyperconjugation means transfer of the sigma electron which are there in between C-H bond to the next carbon which is attached to alfa carbonMore the number of alfa hydrogenAnd then more the number of hyperconjugation structure which leads to stability.
Ram kumar
11 Points
4 years ago
In a system having double, triple, bonds the ¶(sigma bond) is least contributing to the stability of compound since it is not fulfilling the basic cond. of resonance therefore ¶ bond b/w (C-H) is considered as evil and is pressurized by other bonds hence H of -(CH) is sent outside but within the electrostatic range of C ( * bond b/w C-H is not broken since b.e greater than reso_ energy that will lead to instability.) So( -)ve charge comes on C atom which shares it to pure p orbital of other C atom )and makes π bond , now all members of compound are happy & shows max stabily leading to Hyper conjugation . H atom which goes outside is called alpha H more the no of H atoms which goes outside more is hyperconjugation.
Shohan Ahmed
13 Points
4 years ago
In hyperconguhative effect first need a double bond between c atom (c=c). Besides * carbon called alpha carbon who realise a hydrogen ion than the election made a double bond between alpha and * carbon .And than the other double bond election go through the beside the * carbon hade.
15 Points
3 years ago
Hyperconjuation is the interaction of the electron in a sigma orbital with an adjacent empty non bonding orbital,antibondingsigma or pie orbital,to give an extended molecular orbital. Increased electron delocalization associated with hyperconjuation increases the stability of the system 

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