Correct Answer - C
Each of the doubly bonded carbon atoms should be bonded to two different ligands.
Cinnamic acid is the trans-isomer and hence is also known as trans`-beta`-phenylacrylic acid. The cis-siomer (cis-`beta`-phenylacrylic acid) is also known as allocinnamic acid.
trans-Cinnamic acid is the form that occurs naturally (free and as esters) in balsams.
Aspartic acid is `HO_(2)C CH_(2)CH(NH_(2))CO_(2)H`
Butyric acid is `CH_(3)CH_(2)CH_(2)CO_(2)H`
Palmitica acid is `C_(15)H_(31)CO_(2)`
