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Question

Lactic acid is a:

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper PDF (31-Jan-2021) (Shift 1)
The correct answer is
Three-carbon molecule

Lactic Acid Structure Explained

Lactic acid, chemically known as 2-hydroxypropanoic acid, is an organic acid. Its chemical formula is $C_3H_6O_3$.

To determine the number of carbon atoms, examine the structure derived from its formula:

  • The formula $C_3H_6O_3$ indicates three carbon atoms.
  • The structure consists of a three-carbon chain. One carbon is part of a carboxyl group (COOH), another carbon atom is bonded to a hydroxyl group (OH) and a methyl group ($CH_3$), and the third carbon atom is part of the methyl group.

Therefore, lactic acid is classified as a three-carbon molecule.

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