Glyoxal is

Options

A. `CH_(2)O-CH_(2)O`
B. `{:(CH_(2)OH),(|),(CH_(2)OH):}`
C. `{:(CHO),(|),(CHO):}`
D. `{:(CH_(2)OH),(|),(CHO):}`

Answer

### Step-by-Step Solution:

**Step 1: Identify the Structure of Glyoxal**
- Glyoxal is a simple dicarbonyl compound with the molecular formula C₂H₂O₂. It consists of two aldehyde groups (-CHO) attached to a two-carbon chain. The structural formula can be represented as:

\[ O=CHO-CHO \]

**Step 2: Understand the Synthesis of Glyoxal**
- Glyoxal can be synthesized through the oxidation of certain organic compounds. One method involves the oxidation of benzene derivatives. For instance, when benzene is treated with ozone (O₃) and subsequently oxidized, it can yield glyoxal.

**Step 3: Recognize the Importance of Glyoxal**
- Glyoxal is an important compound in organic chemistry and is used in various applications, including the synthesis of other chemical compounds. It is a precursor to dimethylglyoxal, which is significant in coordination chemistry.

**Step 4: Note Related Compounds**
- When one of the aldehyde groups in glyoxal is replaced with a methyl group, it forms methylglyoxal. If both aldehyde groups are replaced with methyl groups, it forms dimethylglyoxal. These compounds are also important in various chemical reactions and applications.

**Step 5: Applications in Coordination Chemistry**
- Dimethylglyoxal (DMG) is particularly noteworthy in coordination chemistry as it can form complexes with metal ions. This property makes it useful as a ligand in various coordination complexes.