# Isomer definitions - quiz

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• Created by: Tasha.L
• Created on: 11-09-16 12:09

## 1. Define 'chain-branching isomer'.

• They have the same molecular formula but interact differently with plane polarised light.
• They have the same molecular formula but a different arrangement of the carbon chain.
• They have the same molecular formula but a different structural formula.j
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## 2. Define 'positional isomer'.

• They have the same molecular formula but a different arrangement of atoms in space.
• They have the same structural formula and chain length, but differ in the position of their functional group.
• They have the same molecular formula but different functional groups.

## 3. Define 'functional isomer'.

• They have the same molecular formula but different functional groups.
• They have the same molecular formula but a different structural formula.
• They have the same molecular formula and chain length, but differ by the position of the functional group.

## 4. Define 'optical isomer'.

• They have the same molecular formula and chain length, but differ by the position of the functional group.
• They have the same molecular formula but interact with plane polarised light differently.
• They have the same molecular formula but a different structural formula.

## 5. Define 'geometric isomer'.

• They occur in alkenes only due to the restricted rotation about the double bond, caused by the pi bond.
• They have the same molecular formula but a different arrangement of atoms in space.
• They have the same molecular formula but differ in how they act with plane polarised light.