CIE A Level Chemistry復習筆記3.1.9 Planarity of Organic Molecules

Category: A-level課程, 教材筆記, 福利干貨 Date: 2022年8月12日下午3:28

Planar molecules have all their atoms in the same plane
- Eg. linear, bent, trigonal planar and square planar

3.1-An-Introduction-to-AS-Level-Organic-Chemistry-Planar-Molecules_1

Molecules which have all their atoms in the same plane

The presence of an sp²?hybridised carbon can force the molecule to adopt a planar configuration?(trigonal planar)
The 3 σ bonds position themselves in a trigonal planar position so that the bonding pair of electrons are as far away from each other and therefore minimise the repulsion between them
- Eg. ethene

3.1-An-Introduction-to-AS-Level-Organic-Chemistry-Planar-Ethene Ethene is a planar molecule with two trigonal planar centres around the carbon atoms

3.1-An-Introduction-to-AS-Level-Organic-Chemistry-Planar-Propene

Propene has two trigonal planar centres around the carbon-carbon double bond and one tetrahedral centre

The presence of an sp hybridised carbon can also force the molecule to adopt a planar configuration (linear)
The 2 σ bonds position themselves in a linear position to minimise the repulsion between the bonding pairs of electrons
- For example, ethyne

3.1-An-Introduction-to-AS-Level-Organic-Chemistry-Planar-Ethyne Ethyne is a planar molecule with one planar centre: the molecule is linear