Saturated fats tend to have straight chain fatty acids. Unsaturated fats have a kink in the chain because the double bond prevents free rotation of atoms. How are the properties of a fat changed if there is a kink in the chain? Straight chain molecules are more attracted to each other than kinked. This makes the melting point of straight chain molecules higher and straight chain molecules are more likely to be solid at room temperature.

Straight chain molecules are more attracted to each other than kinked. This makes the melting point of straight chain molecules lower and straight chain molecules are more likely to be solid at room temperature.

Straight chain molecules are less attracted to each other than kinked. This makes the melting point of straight chain molecules higher and straight chain molecules are more likely to be solid at room temperature.

Straight chain molecules are less attracted to each other than kinked. This makes the melting point of straight chain molecules lower and straight chain molecules are more likely to be solid at room temperature.