Discussion
Assertion (A): Deodorisation is carried out under a high vacuum.
Reason (R): Stripping at atmospheric pressure would require a temperature that damages the oil.
Answer: D
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the necessity. The odour compounds are present at parts per million and are stripped with steam, and at atmospheric pressure the temperature required would oxidise the oil, form trans isomers and darken it. Reducing the pressure to a few millibars lets the same stripping be done around 240 to 260 degrees, which the oil survives.
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