Isomers

What is an isomer?

• Molecules that share the same chemical formula but with different structures.

• Molecules that have a different chemical formula but a similar structure.

• Molecules that share the same chemical formula and the same structure.

• Molecules that share a different chemical formula with different structures.

What is a structural isomer?

• Compounds that have the same connectivity but a different arrangement in 3D shape.

• Compounds that have the same chemical formula but a different atom connectivity.

Do methane and ethane possess structural isomers?

• Yes

• No

Hexane (C6H14) is a structural isomer of these two compounds.

• True

• False

Which of these statements are correct about enantiomers?

• Compounds that are mirror images of each other

• Compounds that are mirror images of each other that are super-imposable

• Compounds that are mirror images of each other that are not super-imposable

• Examples of chiral molecules.

Which statements are true about cis isomers?

• The highest priority substituents lie on the same side of the double bond.

• Cis isomers are also known as E- isomers

• Cis isomers are also known as Z-isomers

• The highest priority substituents lie on different sides of the double bond.

What direction does a R-configuration of a molecule follow?

• Clockwise

• Anti-clockwise

To assign substituent priorities we use...

(a)