Question

Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A): Products like chocolate containing cocoa butter are solid at room temperature and melt smoothly and rapidly in the mouth, giving a cooling effect.
Reason (R): Cocoa butter has a high solid fat content, which declines steeply as the temperature is raised to just below human body temperature.
In light of the above statements, choose the correct answer from the options given below.

• A. Both (A) and (R) are true and (R) is the correct explanation of (A)
• B. Both (A) and (R) are true but (R) is NOT the correct explanation of (A)
• C. (A) is true but (R) is false
• D. (A) is false but (R) is true

Hint:

The sharp melting of chocolate is caused by the unique, uniform triglyceride structure of cocoa butter.
This structure maintains a high solid fat content at room temperature that drops to zero at body temperature, absorbing latent heat and creating a cooling sensation.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
The physical properties of fats (such as cocoa butter or milk fat) are determined by their triglyceride composition.
The solid fat content (SFC) at various temperatures defines the melting profile, plasticity, and sensory characteristics of fat-containing food products.

Step 2: Detailed Explanation:
Let us analyze the relationship between the physical state of cocoa butter and its sensory properties:
-Assertion (A):
Chocolate remains solid and structurally stable at room temperature (20°C to 22°C) without melting on fingers.
However, when placed in the mouth, it melts rapidly and completely, producing a smooth liquid texture and a distinct cooling sensation.
Thus, Assertion (A) is true.
-Reason (R):
Cocoa butter consists mainly of symmetrical monounsaturated triacylglycerols (primarily POP, POS, and SOS).
This simple triglyceride profile gives cocoa butter a sharp melting point.
It has a very high solid fat content (SFC) at temperatures below 25°C, providing the firm, solid structure of chocolate.
As the temperature increases to between 30°C and 35°C (just below human body temperature), the SFC drops rapidly to nearly zero.
This sharp transition causes the chocolate to melt quickly and completely in the mouth.
Since melting is an endothermic phase transition, it absorbs latent heat from the mouth, producing the characteristic cooling effect.
Therefore, both (A) and (R) are true, and (R) is the correct scientific explanation of (A).

Step 3: Final Answer:
Both (A) and (R) are true, and (R) is the correct explanation of (A), which corresponds to Option (A).