Question

The organic structure designation that includes the functional group of an ester among the following is:

• A. R-OH
• B. $R-O-R^{\ast }$
• C. $R-\stackrel{\stackrel{\stackrel{-}{O}}{||}}{C}-H$
• D. $R-\stackrel{\stackrel{\stackrel{-}{O}}{||}}{C}-R^{\ast }$
• E. $R-\stackrel{\stackrel{\stackrel{-}{O}}{||}}{C}-O-R^{\ast }$

Answer 1

Answer: (E)

$R-\stackrel{\stackrel{\stackrel{-}{O}}{||}}{C}-O-R^{\ast }$

The organic structure designation that includes the functional group of an ester is $R-\stackrel{\stackrel{\stackrel{-}{O}}{||}}{C}-O-R^{\ast }$
(R is alkyl group that is not necessarily the same as R).
An example is methyl acetate $C{H}_3-C{H}_2-\stackrel{\stackrel{\stackrel{-}{O}}{||}}{C}-O-C{H}_3$