Both the assertion and the reason in this question are individually true, but the reason is not the correct explanation of the assertion.

Assertion (A) states that saturated fats are more reactive compared to unsaturated fats. This is true because saturated fats do not have any double bonds in their molecules, making them more stable and less reactive compared to unsaturated fats.

Reason (R) states that unsaturated fats have double bonds in their molecules. This is also true, as unsaturated fats contain one or more double bonds in their carbon chain.

However, the reason does not explain why saturated fats are more reactive compared to unsaturated fats. The reactivity of fats is determined by the presence or absence of double bonds, not by the number of double bonds. Unsaturated fats with double bonds are less stable and more prone to undergo chemical reactions, making them more reactive than saturated fats.

Therefore, the correct answer is option 2: Both A and R are individually true, but R is not the correct explanation of A.