Chirality and Optical Activity
Chemistry ⇒ Carbon and Organic Chemistry
Chirality and Optical Activity starts at 11 and continues till grade 12.
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See sample questions for grade 11
A chiral compound rotates plane-polarized light by +20°. What is the expected rotation if the concentration is doubled?
A compound has two chiral centers. How many possible stereoisomers can it have?
A solution contains equal amounts of (+)-lactic acid and (–)-lactic acid. What is the optical rotation of the solution?
Define enantiomers.
Describe the difference between enantiomers and diastereomers.
Describe the effect of a racemic mixture on plane-polarized light.
Explain why 1-chloropropane is achiral.
Explain why 2-chlorobutane is chiral.
Which of the following compounds is achiral? (1) 2-bromopropane (2) 2-chlorobutane (3) 3-chloropentane (4) 2,3-dibromobutane (meso form)
Which of the following compounds is chiral? (1) 2-butanol (2) 2-propanol (3) methane (4) ethane
Which of the following is a property of a racemic mixture? (1) It is optically active. (2) It is optically inactive. (3) It contains only one enantiomer. (4) It has a net rotation of light.
Which of the following is a requirement for a molecule to be optically active? (1) It must have a chiral center. (2) It must be a hydrocarbon. (3) It must have a plane of symmetry. (4) It must be a gas.
A carbon atom bonded to four different groups is called a(n) ________ center.
A molecule that contains a plane of symmetry is usually ________.
Fill in the blank: The enantiomer that rotates plane-polarized light to the left is called ________.
Fill in the blank: The enantiomer that rotates plane-polarized light to the right is called ________.
True or False: A molecule with a chiral center and a plane of symmetry is chiral.
True or False: A molecule with no chiral centers can never be optically active.
True or False: A molecule with two identical chiral centers is always achiral.
True or False: All molecules with a chiral center are optically active.
