Discussion
Assertion: a reaction with 100 per cent yield may still be wasteful. Reason: much of the reactant mass may leave as a by-product.
Answer: C
Correct answer: both the assertion and the reason are true and the reason explains the assertion
Both are true and the reason gives exactly the mechanism. Yield measures how much of the theoretical product was obtained and says nothing about how much of the input mass reaches it. A Wittig reaction in quantitative yield still discards nearly three quarters of its mass as phosphine oxide, which is waste however complete the conversion.
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