Structures of functional groups

Question

How do i draw the structures for each of the following functional groups?

a) carboxylic acid

b) alcohol

c) aldehyde

d) ketone

e) ester

Answer 1

a) R -C-O-H

........II

........O

b)  R-O-H

c) R-C-H

.......II

.......O

d) R-C-R'

.......II

.......O

e) R-C-O-R'

.......II

.......O  

Answer 2

[Answer:

This link will help you:

http://michele.usc.edu/105b/organic/func... ]