Which of the following represent (R)-2-butanol?
A)III and V
B)I,III,IV and V
C)I,IV and V
D)I and III
E)I,II,IV and V

Question

Which of the following represent (R)-2-butanol? 
A)III and V 
B)I,III,IV and V 
C)I,IV and V 
D)I and III 
E)I,II,IV and V

Quizplus · Accepted Answer

(R)-2-butanol has the hydroxyl (-OH) group attached to the second carbon atom, which is chiral. Therefore, it has two stereoisomers, (R)-2-butanol and (S)-2-butanol. In the given options, only structures I, IV, and V have the -OH group attached to the second carbon atom. Among these, only structures I and IV have chiral center at second carbon.

Structure I is (S)-2-butanol because the -CH3 group and -H group are on the left side of the chiral carbon. Therefore, structure IV and V must be (R)-2-butanol. Hence, the correct choice is C, i.e., I, IV and V represent (R)-2-butanol.

Which of the Following Represent (R)-2-Butanol