In which of the following methyl group is present in the fifth position of heterocyclic carbon compound?

Cytosine

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Thymine

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Adenine

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Guanine

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Solution

The correct option is B Thymine
Thymine, also known as 5-methyluracil, is one of the five main nucleobases found in DNA. It is a pyrimidine base and binds to adenine via two hydrogen bonds. Thymine is replaced by uracil in RNA.
So, the correct answer is option B.

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