Question

heyya......

explain about hyperconjugation.....

I want some tricks to identify hyperconjugation...

80 points..!!

Answer 1

hola frnds see it's.......

hyperconjugation occurs due to alpha hydrogen, which is the hydrogen attached to alpha carbon, and alpha carbon is that carbon to which functional group is directly attached. So in short, in order to find number of hyperconjugations, count the number of alpha hydrogen.......


Identify:....3 years ago number of hyperconjugation structures for a hydrocarbon with number of 'alpha' hydrogens 'a' equal to 'a' or 'a+1' 3 years ago Number of hyperconjugating structure is equal to number of alpha hydrogen atoms plus one. The addition of one is due to the original structure that is given which is itself a hyperconjugating structure...

happy New year....

Answer 2

Here's your answer!
In organic chemistry, hyperconjugation is the interaction of the electrons in a sigma orbital with an adjacent empty non-bonding or antibonding σ or π orbital to give an extended molecular orbital. Increased electron delocalization associated with hyperconjugation increases the stability of the system

HOW TO IDENTIFY HYPERCONJUGATION

We know that methyl group is electron releasing i.e. has +I inductive effect. The alkyl group attached to positively charged carbon atom tends to release electrons towards carbon. This decreases the positive charge on the carbon atom but the carbon itself is somewhat positive. As a result, the positive charge on the carbon atom gets dispersed, giving it stability. Therefore, more the number of alkyl groups, the greater will be the dispersal of charge and therefore, more stable will be the carbocation.
Thus, tertiary carbocation in which there are three alkyl groups attached to positive carbon is more stable than a secondary carbocation with two alkyl groups. Similarly, a secondary carbocation is more stable than a primary carbocation, which in turn is more stable than methyl carbocation:


Thus, the order of stability is: CH3+ < 1o < 2o < 3o
Other carbocations are benzyl carbocation, which is primary in nature but is highly stable because of resonance stabilization.


Triphenyl carbocation, Ph3C+ is the most stable because of resonance stabilization among three phenyl groups.


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