Isomers

How many different groups must be attached to a carbon for it to be considered chiral?

• 1

• 2

• 3

• 4

Most stable conformation of cyclohexane is

• chair

• boat

• twist boat

• half chair

In a stereoisomer, ________ means "on the same side" and ______ means "across from."

• cis; trans

• cis; L

• D; L

• trans; cis

Geometric isomers shown below is called

• Cis/trans 1,2 dichloroethane
• Cis/trans 1,2 dichloroethene
• Cis/trans 1,2 chloroethane
• Cis/trans 1,2 chloroethene

How to determine that a molecule exhibit cis-trans isomerism?

• Restricted rotation in a carbon-carbon single bond of alkenes

• Each carbon of a site of restricted rotation has 2 different atoms or groups attached to it

• Exist in cyclic compouds only

• Similar chemical properties

Which of the following compound(s) exhibit(s) cis-trans isomerism?

(1) 1,2-dibromo-1,2-dichloroethene

(2) 3,3-dibromo-2-chloropropene

(3) 1,2-dichloropropene

• (1) only

• (2) only

• (1) and (3) only

• (2) and (3) only

Which Isomer has a HIGH Boiling Point?

• Isomer A

• Isomer B

Compounds that are composed of the same number and type of atoms but have them arranged in different ways are ___________.

• isomers

• isotopes

• polymers

• alkanes

Chiral carbons will produce _____________.

• structural isomers

• optical isomers

• polymers

• monomers

What operation would transform 2,2 dimethylbutane into hexane?

• Adding one carbon and three hydrogen atoms.

• Moving a methyl group to the other end of the molecule.

• Moving both methyl groups, one to each end of the molecule

• Rotating the molecule.