The table shows the molecular formulae of three molecules $$\(P, Q\)$$ and $$\(R\)$$. None of the molecules are cyclic. Which molecules show a strong absorption between $$\(1610 \mathrm{~cm}^{-1}\)$$ and $$\(1750 \mathrm{~cm}^{-1}\)$$ in their infra-red spectra?
A.
Q only
B.
R only
C.
\(Q\) and \(R\) only
D.
\(P, Q\) and \(R\)
Exam No：9701_s20_qp_12 Year：2020 Question No：21
Answer:
C
Knowledge points:
22.1.1 analyse an infrared spectrum of a simple molecule to identify functional groups (see the Data section for the functional groups required)
Solution:
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