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Categorize the following according to their property:
  
 
Answer variants:
\(-CH_2-CH_4\)
\(-COOH\)
\(R-CH\)
Eth-
\(-Cl\)
Set-
  
1. Class of compounds and its functional group:
 
Carboxylic acid -
 
2. Root words of hydrocarbons:
  
\(2\) -
 
3. Prefix for IUPAC Name:
 
Chloro -