Organic Chemistry Practice Questions with Answers (Set 6)

1. Which of the following statements is true?
a.Biologically important organic molecules never exhibit enantiomerism.
b.Very few biologically important organic molecules exhibit enantiomerism.
c.The vast majority of biologically important organic molecules exhibit enantiomerism.
d.All biologically important organic molecules exhibit enantiomerism.

2. If a carbon atom is a stereocenter, which of the following statements must be true about that carbon?
a.It has four single bonds.
b.It has a double bond and two single bonds.
c.It has two double bonds.
d.Any of these bonding arrangements can be associated with a stereocenter.

3. Given the compounds 2,3-dimethylpentane and 2,4-dimethylpentane, which of the following is true?
a.Only 2,3-dimethylpentane is chiral.
b.Only 2,4-dimethylpentane is chiral.
c.Both are chiral.
d.Neither is chiral.

4. Given the compounds 2,3-dimethylpentane and 3-methylhexane, which of the following is true?
a.Only 2,3-dimethylpentane is chiral.
b.Only 3-methylhexane is chiral.
c.Both are chiral.
d.Neither is chiral.

5. There are four alcohols with the molecular formula C4H9OH. How many of these are chiral?
a.0
c.2
b.1
d.3

6. Which of the three isomeric alcohols, 2-butanol, 2-methyl-1-propanol, and 2-methyl-2-propanol, are chiral?
a.only 2-butanol
b.only 2-methyl-1-propanol
c.both 2-butanol and 2-methyl-1-propanol
d.both 2-methyl-1-propanol and 2-methyl-2-propanol

7. Which of the structures given below represents the enantiomer of the following compound ?
a.only
b.only
c.both a and b
d.neither b nor b

8. How many stereocenters are present in the following compound?

a.1
c.3
b.2
d.4

9. Which of the following compounds can exist as a pair of enantiomers?

a.(i) and (ii) only
c.(i) and (iii) only
b.(ii) and (iii) only
d.(i) only

10. In the R,S system, which of the following groups has highest priority?
a.alkyl
c.hydroxyl
b.amino
d.thiol

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