Cis-trans isomers (geometric isomers) are molecules that a) are isomers in which one of the molecules contains an amino group and the other contains a phosphate group b) differ in their molecular formulas c) differ in the arrangement of their atoms about a double bond d) are isomers that differ in the covalent partnerships between their atoms e) are mirror images

C) differ in the arrangement of their atoms about a double bond

Explanation:

Cis-trans isomers -

Isomers are the molecules which have the same molecular formula but they differ in their arrangement of atoms.

The two isomers possible are the cis and the trans isomer .

1. Cis - isomer - The priority group or the similar group are at same side of the double bond .

2. trans - isomer -  The priority group or the similar group are at different side of the double bond . ( the group are diagonally present )

Hence , the option about cis - trans isomer is ( c ) .