Discussion
Assertion (A): Deodorisation is the last major refining step.
Reason (R): It strips volatile flavour and odour compounds by steam distillation under high vacuum.
Select the correct answer from the options below.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason explains the position. Deodorisation strips the volatile aldehydes, ketones and residual free fatty acids that carry flavour and odour, by steam distillation at a few millibars absolute.
It comes last because it removes the very compounds that earlier steps generate or leave behind, and because any impurity still present - a phosphatide, a trace metal - would be darkened by the temperature it uses. Doing it earlier would mean re-contaminating a finished oil, so the sequence is fixed by what each step leaves for the next.
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