Which of the following statements explains how IR could be used to identify each

Question

Which of the following statements explains how IR could be used to identify each of the five dyes in Figure 1? Molecule 5 and "HPSensor 3" would have additional IR peaks due to the additional unique functional groups N-O and N-H, respectively. The structural differences of "HPSensor 1" and "HPSensor 2" also would have additional IR peaks due to the additional unique functional groups C-O and C-o-, respectively. O A Each molecule in the series has different functional groups so they will be easily distinguishable using IR spectroscopy Molecule 5 and "HPSensor 2" would have additional IR peaks due to the additional unique functional groups N-o and C-O, respectively. However, the structural differences of "HPSensor 1 and "HPSensor 3" do not add additional functional groups so it will be difficult to identify these molecules except maybe by slight differences in the peak positions and intensities due to the different molecular environments. O C Molecule 5 and "HPSensor 1" would have additional IR peaks due to the additional unique functional groups N-O and C-o, respectively. However, the structural difference functional groups so it will be difficult to identify these molecules except maybe by slight differences in the peak positions and intensities due to the different molecular environments. s of "HPSensor 2" and "HPSensor 3" do not add additional O D would The differences between the molecules do not include changes in unique functional groups. Therefore, IR not be useful in distinguishing the identity of each dye.

Explanation / Answer

The answer is (b)

Explanation:

If two molecules are different then their IR spectra will be different. They can be distinguished by comparing the spectra in finger-print region (400 cm-1 to 1500 cm-1). Spectra in finger print region are complicated, so it will not be easy. But, the presence of unique functional group will make the process easy.

(a) HPsensor 2, will not have unique peak for C-O, as this funtional group is already present (lower part of molecule). So, wrong statement

(c) HPsensor 1 and HPsensor 3 can be distinguished by the NO2 strong peak (1600-1500 and 1400-1300 cm-1). So, again wrong statement.

(d) HPsensor 2 and HPsensor 3 can be distingished by looking for N-H peak (3500-3350 cm-1). So, again wrong.

(e) well you can distinguish them.

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