Explore topic-wise MCQs in Organic Chemistry.

This section includes 5 Mcqs, each offering curated multiple-choice questions to sharpen your Organic Chemistry knowledge and support exam preparation. Choose a topic below to get started.

1.

A substance absorbs 2.0 x 1016 quanta or radiations per second and 0.002 mole of it reacts in 1200 seconds. What is the quantum yield or the reaction (N = 6.02 x 1023)?

A. 50
B. 40
C. 80
D. 100
Answer» B. 40
Discussion
2.

Which of the following are the reactions in which molecules absorbing light do not themselves react but induce other molecules to react?

A. Free radical reactions
B. Chain reactions
C. Reversible reactions
D. Photosensitized reactions
Answer» E.
Discussion
3.

The quantum efficiency of a photochemical reaction is defined as _______

A. ratio of molecules decomposed in a given time to the number of quanta absorbed in the same time
B. number of 11101ecules decomposed in a given time
C. number or quanta absorbed percent time
D. ratio of molecules decomposed in a given time to the number of quanta emitted in the same time
Answer» B. number of 11101ecules decomposed in a given time
Discussion
4.

A 0.1 M solution of compound A shows 50% transmittance when a cell of 1 cm width is used at 1 nm. Another 0.1 M solution of compound B gives the optical density value of 0.1761 using 1cm cell at 1 nm. What will be the transmittance of a solution that is simultaneously 0.1 M in A and 0.1 M in B using the same cell and at the same wave length? [log 1.301; log 1.4771; log 50 = 1.699].

A. 33.3%
B. 50%
C. 66.7%
D. 70%
Answer» B. 50%
Discussion
5.

Which regions of the light radiations of the visible ultraviolet lying between wavelength are chiefly concerned in bringing about photochemical reactions?

A. 1000 and 2000
B. 1500 and 1000
C. 8000 and 2000
D. 19000 and 12,000
Answer» D. 19000 and 12,000
Discussion