20.3 Practice

What is name of this compound applying IUPAC rules?

• E 1-bromo-1-chlorobut-1-ene

• Z 1-bromo-1-chlorobut-1-ene

• E 1-bromo-1-chloro-2-ethylethene

• Z 1-bromo-1-chloro-2-ethylethene

Tags

NGSS.HS-PS1-1

Which molecule contains a chiral carbon?

• CH3CH2CHBrCH2CH3

• CH3CH2CHBrCH3

• CH2BrCH(CH3)CH2Br

• CH3CH2CH2CH2CH2Br

Which isomers exist as non-superimposable mirror images?

• cis-trans isomers

• diastereomers

• enantiomers

• structural isomers

What is the number of optical isomers of isoleucine?

• 0

• 2

• 4

• 8

Which pair of isomers always shows optical activity?

• Cis-trans

• Enantiomers

• Conformational

• E/Z

Which molecule is chiral?

• 2-chlorobutane

• 2,2-dichloropentane

• Propan-2-amine

• 4-hydroxybutanoic acid

Which statement is correct for a pair of enantiomers under the same conditions?

• A racemic mixture of the enantiomers is optically active.

• They have the same chemical properties in all their reactions.

• They have the same melting and boiling points.

• They rotate the plane of plane-polarized light by different angles.

Which molecule contains a chiral carbon?

• CH3CHOHCH2CH3

• (CH3)3CCHO

• (CH3)3COH

• (CH3)3COC(CH3)3

Which pair are geometric isomers? (old syllabus: geometric = E/Z or cis/trans)

• see image

• see image

• see image

• see image

How many four-membered ring isomers are there of dichlorocyclobutane, C4H6Cl2?

• 3

• 4

• 5

• 6