[单选题]
Compound Y has the mo
* +n*1eo) mxn6uyviis1lxf z bzzlo0d2 y5:t5lecular formula C4H8O2CXHXOX and produces the foll
+: gca7e7came z7xpb4owing IR
a+xgcce4eb m:p 777 azspectrum.
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 $cm^{−1}$.
