Inductive Effect
Describes the permanent displacement of σ electrons along a carbon chain due to the presence of an electron-withdrawing or electron-donating group.
What is Inductive Effect?
A permanent effect in which electron density is permanently displaced along a carbon chain due to the difference in electronegativity between bonded atoms.
Key points
- Define and explain the inductive effect.
- Differentiate between electron-donating and electron-withdrawing inductive effects.
- Predict the direction and magnitude of the inductive effect in simple molecules.
- Understand how the inductive effect influences molecular properties.
Common exam trap
Confusing inductive effect with resonance effect.
Definitions
- Term
Inductive Effect
- Meaning
A permanent effect in which electron density is permanently displaced along a carbon chain due to the difference in electronegativity between bonded atoms.
- Term
Electron-Donating Inductive Effect (I+)
- Meaning
The effect where an alkyl group or other substituent pushes electron density towards the carbon chain.
- Term
Electron-Withdrawing Inductive Effect (I-)
- Meaning
The effect where an electronegative atom or group pulls electron density away from the carbon chain.
Learning objectives
Define and explain the inductive effect.
Differentiate between electron-donating and electron-withdrawing inductive effects.
Predict the direction and magnitude of the inductive effect in simple molecules.
Understand how the inductive effect influences molecular properties.
Prerequisites
Electronegativity
Covalent bonding
Σ bonds
Basic organic functional groups
Common mistakes
Confusing inductive effect with resonance effect.
Assuming the inductive effect extends indefinitely along a chain.
Incorrectly assigning electron-donating or withdrawing nature to groups.
Overestimating the strength of the inductive effect at longer distances.
Keywords
Inductive effect
Electronegativity
Σ bond polarization
Electron-donating
Electron-withdrawing
I+ effect
I- effect
Organic chemistry
Reactivity
Practice preview
Which of the following groups exhibits a positive inductive effect (+I)?…
easy
Arrange the following groups in increasing order of their negative inductive effect (-I): -COOH, -NO2, -CN, -F…
medium
Which of the following amines is the most basic in aqueous solution?…
medium