Which of the following compounds is not obtained by complete hydrolysis of RNA?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → Thymine
Complete hydrolysis of a nucleic acid gives a pentose sugar, phosphoric acid and the nitrogenous bases. Thymine is found only in DNA; RNA has uracil in its place.
Option (1) Uracil — Obtained on hydrolysis of RNA. It is the base found only in RNA.
Option (2) β-D-Ribose — Obtained on hydrolysis of RNA. It is the sugar of RNA.
Option (3) Phosphoric acid — Obtained on hydrolysis of RNA. It comes from the phosphate links that join the nucleotides.
Option (4) Thymine — Not obtained on hydrolysis of RNA. Thymine occurs only in DNA.
NCERT (2026-27 edition):
Chemical Composition of Nucleic Acids
