To complete the table of physical structures for the main functional groups, let's detail the structural representations for each group.
1. Alcohol: Represented structurally as:
```
R-OH
```
where R is any alkyl or aryl group bonded to a hydroxyl group (-OH).
2. Ether: Represented structurally as:
```
R
\
O
/
R'
```
where R and R' are alkyl or aryl groups bonded to an oxygen atom.
3. Ketone: A ketone has the structure defined by:
```
O
||
R-C-R'
```
where R and R' can be different or identical alkyl or aryl groups attached to a carbonyl group (C=O).
4. Aldehyde: Represented structurally as:
```
R-CHO
```
where an alkyl or aryl group (R) is bonded to a formyl group (–CHO).
5. Carboxylic Acid: Has the structure:
```
R-COOH
```
where R is bonded to a carboxyl group (COOH).
6. Ester: Represented structurally as:
```
R-COOR'
```
where an alkyl or aryl group (R) is bonded to a carbonyl group (C=O), which is further bonded to an alkoxy group (OR').
Given these descriptions, we can organize the complete table as follows:
[tex]\[
\begin{tabular}{|c|c|c|c|c|c|}
\hline
Alcohol & Ether & Ketone & Aldehyde & \begin{tabular}{l}
Carboxylic \\
acid
\end{tabular} & Ester \\
\hline
\begin{tabular}{l}
$R$ \\
$ | $ \\
$ O $ \\
$ | $ \\
$ H$
\end{tabular}
&
\begin{tabular}{l}
$R$ \\
$ \ $ \\
$ O $ \\
$ / $ \\
$R'$
\end{tabular}
&
\begin{tabular}{l}
$R $ \\
$ | $\\
$C $ \\
$ | ||$\\
$-C- $\\
$ | R'$
\end{tabular}
&
\begin{tabular}{l}
$\\ $R-C=O$ \\
$| \\
\end{tabular}
&
\begin{tabular}{l}
$R-C-OH$ \\
$ ||$\\
$ O $
\end{tabular}
&
\begin{tabular}{l}
$R-C-O-R'$ \\
$ || $\\
$ O $
\end{tabular}
\\
\hline
\end{tabular}
\][/tex]
