Answer:
The correct answer is- 2' OH group
Step-by-step explanation:
There is a difference between the composition of RNA and DNA. RNA contains ribose sugar while DNA contains deoxyribose sugar. So in RNA, there is extra hydroxy group present which is attached with the 2nd carbon of ribose sugar.
This spare hydroxyl group makes the RNA unstable than DNA because it is reactive in nature which makes it prone to hydrolysis by enzymes while in DNA only 3' position of sugar contains OH group which is then used to form phosphodiester bond so no reactive OH group remains free in DNA. Therefore the correct answer is 2' OH group.