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MCQ on Fluorescence spectroscopy: Page-9

Which of the following groups on solvent may cause fluorescence quenching? img

(A) P only

(B) R only

(C) Q, R

(D) P,Q and R

Fluorescence is a result of transition of electron from

(A) Singlet ground state to singlet exited state

(B) Lower singlet exited state to singlet ground state.

(C) Triplet exited state to singlet ground state

(D) Triplet ground state to singlet exited state

Which of the following heterocyclic ring has greater quantum yield of fluorescence

(A) Quinoline

(B) Pyrrole

(C) Pyridine

(D) Furan

When the average life time of the excited electron is in the order of 10­ -12 sec it mainly results in

(A) Fluorescence

(B) Phosphorescence

(C) Vibrational relaxation

(D) All of the above