Step 1: Identify chloral.
Chloral is an organic compound with the formula CCl$_3$CHO, consisting of a trichloromethyl group (CCl$_3$) attached to an aldehyde group (CHO). It is commonly used in the synthesis of chloral hydrate.
Step 2: Analyze the options.
- CCl$_3$CHO is the correct structure for chloral.
- The other options are different compounds with varying groups attached to the trichloromethyl group but do not represent chloral.
Step 3: Apply to the options.
The correct formula for chloral is (A) CCl$_3$CHO.
Final Answer:
\[
\boxed{\text{CCl}_3\text{CHO}}
\]