Discussion
Assertion (A): A fat is solid at room temperature while an oil is liquid.
Reason (R): Saturated and longer chains pack more readily into a crystal than unsaturated ones.
Answer: C
Both are true and the reason gives the cause: a cis double bond puts a kink in the chain that prevents close packing, which is why unsaturated oils stay liquid to much lower temperatures. Trans isomers pack almost as well as saturated chains.
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