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MCQ on Fluorescence spectroscopy: Page-2

An organic compound has shown emission patterns as below when it is excited at 254 nm. img Select the type of fluorescence observed

(A) Stoke’s fluorescence

(B) Anti-stoke’s fluorescence

(C) Resonant fluorescence

(D) No fluorescence

Which of the following compounds doesn’t fluoresce?

(A) Compound with multiple conjugated bonds

(B) Conjugation with electron donating group

(C) Polycyclic compounds

(D) Non planar compounds

Phosphorescence mainly results from

(A) Internal conversion

(B) Vibrational relaxation

(C) Intersystem crossing

(D) All of the above

Which of the following factors cause fluorescence quenching?
(P) Increase in viscosity

(A) P,R

(B) Q,S

(C) P,S

(D) Q,R

In fluorescence spectroscopy, emission spectra is obtained by keeping

(A) Excitation wavelength constant

(B) Emission wavelength constant

(C) Both excitation and emission wavelength constant

(D) Both excitation and emission wavelength varying