Question 1

Which of the following statements best describes an enantiomer?

Accepted Answer

An enantiomer is the mirror image of any chiral molecule that is non-superimposable.

Question 2

A molecule is considered achiral if:

Accepted Answer

It has an internal line of symmetry.

Question 3

Which of the following molecules is chiral?

Accepted Answer

A molecule with no internal line of symmetry and at least one stereocenter.

Question 4

Given a molecule with the following structure: $$\mathrm{CH_3CH(OH)CH_3$}$$, determine if it is chiral or achiral.

Accepted Answer

Achiral, because it has an internal line of symmetry.

Question 5

Which test can be used to determine if a molecule is achiral?

Accepted Answer

Check if the molecule has an internal line of symmetry.

Question 6

A student draws the mirror image of a molecule and finds it is superimposable on the original. What can be concluded?

Accepted Answer

The molecule is achiral.

Question 7

Which of the following best explains why a molecule with a plane of symmetry is achiral?

Accepted Answer

Because the plane of symmetry makes the two halves of the molecule identical, so the mirror image is superimposable.

Question 8

Consider the following molecule: $$\mathrm{CH_3CH_2CH(OH)CH_3$}. Is $$this molecule chiral or achiral?

Accepted Answer

Chiral, because it has a stereocenter at the carbon with the OH group.

Question 9

Which of the following is a correct application of the line of symmetry test?

Accepted Answer

If a molecule has a line of symmetry, it is achiral.

Question 10

A molecule has the following structure: $$\mathrm{HOCH_2CH_2CH_2OH}. Is $$this molecule chiral or achiral?

Accepted Answer

Achiral, because it has an internal line of symmetry.

Question 11

Which of the following real-world examples best illustrates the concept of chirality?

Accepted Answer

A pair of gloves, which are mirror images but not superimposable.

Question 12

A molecule is found to have no stereocenters and an internal plane of symmetry. Which of the following is true?

Accepted Answer

It is achiral.

Question 13

Which of the following molecules would NOT be chiral?

Accepted Answer

A molecule with a plane of symmetry.

Question 14

A chemist is analyzing a new drug molecule and finds that it has a single stereocenter and no plane of symmetry. What can be inferred about the molecule?

Accepted Answer

It is chiral and will have a non-superimposable mirror image (enantiomer).

Question 15

Which of the following best describes a meso compound?

Accepted Answer

A compound that is achiral despite having stereocenters, due to an internal plane of symmetry.

Question 16

A molecule has two stereocenters and a plane of symmetry. What is the best classification for this molecule?

Accepted Answer

Meso compound

Question 17

Which of the following is a correct statement about the relationship between chirality and optical activity?

Accepted Answer

Chiral molecules are typically optically active because they rotate plane-polarized light.

Question 18

A molecule is found to have a mirror image that is different from itself. What does this indicate?

Accepted Answer

The molecule is chiral.

Question 19

Which of the following is NOT a method to determine if a molecule is chiral?

Accepted Answer

Counting the number of carbon atoms.

Chirality, Symmetry, and Enantiomers in Organic Molecules

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