Assertion :The heterocyclic compounds in nucleic acid are the nitrogenous bases. Reason: Adenine and guanine are substituted pyrimidines while uracil, cytosine and thymine are substituted purines.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Nucleic acids are polynucleotides. A nucleotide has three chemically distinct components one is a heterocyclic compound, the second is a monosaccharide and the third a phosphoric acid are nitrogenous bases named adenine guanine, uracil, cytosine and thymine. Adenine and guanine are substituted purine while the rest are substituted pyrimidines formed from the skeletal heterocyclic rings purine and pyrimidine respectively.
So, the correct answer is 'Assertion is correct but Reason is incorrect'.

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