IR Spectroscopy
MCQs for CSIR NET & GATE
Organic Spectroscopy
Topic wise Assignment-1
Q1. which of the following spectroscopic techniques will be useful to distinguish between M-SCN and M-NCS binding modes?
(b) IR
(c) EPR
(d) Mass
Q2. The order of carbonyl stretching frequency in IR Spectra of ketone, amide and anhydride is-
(b) ketone > amide > anhydride
(c) amide > anhydride > ketone
(d) anhydride > ketone > amide
Q3. In the IR spectrum, carbonyl absorption band for the following compound appears at
(a) 1810 cm-1
(b) 1770 cm-1
(c) 1730 cm-1
(d) 1690 cm-1
Q4. In the IR spectrum of p-nitrophenyl acetate, the carbonyl absorption band appears at
(b) 1700 cm-1
(c) 1730 cm-1
(d) 1760 cm-1
Q5. In the IR spectrum, the absorption band due to carbonyl group in phenyl acetate appears at
(b) 1760 cm-1
(c) 1710 cm-1
(d) 1660 cm-1
Q6. In the IR spectrum of p-nitrophenyl acetate, the carbonyl absorption band appears at
(b) 1700 cm-1
(c) 1730 cm-1
(d) 1770 cm-1
Q7. Compound that exhibits sharp bands at 3300 cm-1 and 2150 cm-1 in the IR spectrum is
(b) 2-butyne
(c) butyronitrile
(d) butylamine
Q8. Correctly matched structure and carbonyl stretching frequency set is
(a) P-Y , Q-Z , R-X
(b) P-Y , Q-X , R-Z
(c) P-Z , Q-Y , R-X
(d) P-X , Q-Z , R-Y
Q9. Among the following, the compound that displays an IR band at 2150 cm-1 is
Q10. The compound which shows IR frequencies at both 3314 and 2126 cm-1 is
(b) CH3(CH2)4CH2C≡N
(c) CH3(CH2)4CH2C≡CH
(d) CH3(CH2)2C≡C(CH2)2CH3
Ans Key:
1.b 2.d 3.b 4.d 5.b 6.d 7.a 8.a 9.c 10.c