Assertion (A) : Unsaturated fats are more reactive compared with the saturated fats. Reason (R) : Unsaturated fats have only single bonds in their structure.

Assertion is true: unsaturated fatty acids contain carbon–carbon double bonds which provide reactive sites for addition reactions (e.g., catalytic hydrogenation) and make them prone to oxidation (rancidity), so they are generally more chemically reactive than saturated fats [3]. Reason is false: it incorrectly states unsaturated fats have only single bonds — by definition unsaturated compounds contain one or more double (or triple) bonds, whereas saturated compounds contain only single C–C bonds [4]. Thus A is true but R is false; the presence of double bonds (not single bonds) explains the increased reactivity of unsaturated fats [2].

Sources

1. [1] Science , class X (NCERT 2025 ed.) > Chapter 4: Carbon and its Compounds > Figure 4.10 Structure of benzene > p. 65
2. [2] Science , class X (NCERT 2025 ed.) > Chapter 4: Carbon and its Compounds > 4.3.3 Addition Reaction > p. 71
3. [3] Science , class X (NCERT 2025 ed.) > Chapter 1: Chemical Reactions and Equations > 1.3.2 Rancidity > p. 13
4. [4] Science , class X (NCERT 2025 ed.) > Chapter 4: Carbon and its Compounds > 4.2 VERSATILE NATURE OF CARBON > p. 62