In which among the following organic compound, carboxyl group is present?

The correct answer is Ethanonic acid.

Key Points

• Carboxyl group
  • It is defined as carbonyl and hydroxyl attached to a carbon atom, which means the carbon atom is double-bonded with oxygen and a single bond with the hydroxyl.
  • And Carboxylic acid is an organic compound that consists of a carboxyl group.
  • The general formula of the class is R-C(O)OH.
  • In this formula, R is the alkyl or aryl group.
  • Carboxylic acids occur widely in nature.
  • However, the majority of the members of this group are manufactured synthetically.
  • The double bond present in the structure of carboxylic acids plays a very important role in the properties of the different compounds of carboxylic acids.
  • When a carbon compound is attached to the functional group −COOH (carboxyl group) then the compound refers to as carboxylic acids.
  • The above structure formula of ethanoic acid is CH₃COOH, hence it contains a carboxylic acid group. Hence, Option 4 is correct.

Image of Carboxyl Group:

Additional Information

• ​​CH2=CH2 is the chemical formula of Ethylene.
• Ethanol is commonly known as Ethyl Alcohol.
• Its chemical formula is C2H5OH.
• Formaldehyde is the simplest member of the family of carbonyl compounds and differs from other members in the respect that it has only one hydrogen atom attached to the functional group in place of an alkyl substituent.
• The functional group of -OH is Alcohol.
• The functional group of >C=O is Ketone.
• The functional group of -COOH is Carboxylic acid.
• Functional group -CHO is present in Aldehydes.