Classification of Matter A.2 Classification of Organic Compounds (id: c196451df)

本题目来源于试卷: Classification of Matter A.2 Classification of Organic Compounds，类别为 IB化学

[单选题]
Compound Y has the molecb3;u +gn.7+ji h uqgtga oe3p j4byu2*ular /dppet3v ba70nc2d1n. evti2 formula C4H8O2CX​HX​OX​ and produces the following IR s2/icpb n dvp3e7tavn1.e d0t2pectrum.
Which gives a possible structure for Y?
($IR\,absorptions: C=O: 1700−1750\,cm^{−1}$;
O−H ($alcohol$): 3200−3600 $cm^{−1}$ ($broad$);
O−H ($carboxylic acid$): 2500−3000 $cm^{−1}$ ($very broad)$)

A.
B.
C.
D.


参考答案:  A


本题详细解析:
Explanation:

The spectrum shows peaks for O−HO−H (alcohol) and C=O. The O−HO−H peak is a characteristic broad O−HO−H peak and not one characteristic of the O−H group in a carboxylic acid.

B is incorrect as it is a carboxylic acid and would have a very broad O−HO−H (carboxylic acid): 2500−3000 $cm^{−1}$.

C is an ester and so would not have the broad O−HO−H (alcohol): 3200−3600 $cm^{−1}$ peak.

D does not have a C=O bond and so would not have the strong peak at 1700−1750 $cm^{−1}$.

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