Question

question 26 of 30
what does the prefix cis- in the name of a stereoisomer indicate about the functional groups?

a. the groups are on the same side of the double bond.

b. the groups are on opposite sides of the double bond.

c. the groups are fixed in place around the double bond.

d. the groups can rotate around the double bond.

Explanation:

In stereochemistry, the prefix "cis - " for a stereoisomer (specifically in cis - trans isomerism around a double bond) indicates that the functional groups (or substituents) are on the same side of the double bond. Option B describes "trans - " isomerism (groups on opposite sides). Option C is a general property of double bonds (restricted rotation leading to fixed groups, but not specific to cis), and option D is incorrect as double bonds have restricted rotation, so groups can't freely rotate around them.

Answer:

A. The groups are on the same side of the double bond.