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MCQ on IR spectroscopy: Page-4

1. The possible number of vibrational bands for CO 2 is

(A) 2

(B) 3

(C) 4

(D) 5

17. Which of the following bending vibration takes place in different planes.

(A) Asymmetric stretching

(B) Rocking

(C) Scissoring

(D) Twisting

18. Non-dispersive IR spectrophotometer will not have

(A) Source

(B) Monochromator

(C) Cell

(D) Detector

4. According to Hook’s law which of the following linkages will have more force constant?
force constant

(A) R

(B) P

(C) P and R will have equal and greater force constant

(D) It will be equal for all P,Q and R

As the bond strength increases, force constant increases

5. Which of the following transitions mainly occur in IR?

(A) Electronic transitions only

(B) Rotational and vibrational transitions

(C) Rotational transitions only

(D) All the electronic, rotational, vibrational transitions