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Q.

The presence or absence of hydroxyl group on which carbon atom of sugar differentiates RNA and DNA?

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a

4th

b

1st

c

2nd

d

3rd

answer is C.

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Detailed Solution

RNA has a hydroxy group on the second carbon which is not present in DNA.
Thus, hydroxy group on a second carbon atom of the sugar differentiate between RNA and DNA.

The structures are

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