what is an inductive effect class 11
Answers
In chemistry and physics, the inductive effect is an experimentally observed effectof the transmission of unequal sharing of the bonding electron through a chain of atoms in a molecule, leading to a permanent dipole in a bond. ... This is the electron-withdrawing inductive effect, also known as the -I effect.
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The polarization of a σ bond due to electron withdrawing or electron donating effect of adjacent groups or atoms is called inductive effect.
Salient features of inductive effect
* It arises due to electronegativity difference between two atoms forming a sigma bond.
* It is transmitted through the sigma bonds.
* The magnitude of inductive effect decreases while moving away from the groups causing it.
* It is a permanent effect.
* It influences the chemical and physical properties of compounds.
The inductive effect is divided into two types depending on their strength of electron withdrawing or electron releasing nature with respect to hydrogen.
1) Negative inductive effect (-I):
The electron withdrawing nature of groups or atoms is called as negative inductive effect. It is indicated by -I. Following are the examples of groups in the decreasing order of their -I effect:
NH3+> NO2 > CN > SO3H > CHO > CO > COOH > COCl > CONH2> F > Cl > Br > I > OH > OR > NH2>C6H5
2 ) Positive inductive effect (+I)
: It refers to the electron releasing nature of the groups or atoms and is denoted by +I. Following are the examples of groups in the decreasing order of their +I effect.
C(CH3)3> CH(CH3)2> CH2CH3> CH3> H
Why alkyl groups are showing positive inductive effect?
Though the C-H bond is practically considered as non-polar, there is partial positive charge on hydrogen atom and partial negative charge on carbon atom. Therefore each hydrogen atom acts as electron donating group. This cumulative donation turns the alkyl moiety into an electron donating group.
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