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Free download in PDF UV-Visible Spectroscopy Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like UPSC, NDA, SSC etc. These short solved questions or quizzes are provided by Gkseries./p>
(1)
Select the wavelength range corresponding to UV-visible region.
[A]
400-800 nm
[B]
200-800 nm
[C]
25 μm-2.5 μm
[D]
2.5 μm – 1mm
(2)
If the above compound was completely reduced, what will be the possible transitions it can undergo?
[A]
n→p*
[B]
s→s*
[C]
p→p*
[D]
n→s*, s→s*
(3)
On increasing pH, phenol shows
[A]
Q,R
[B]
P,R
[C]
Q,S
[D]
P,S
(4)
The approximate lambda max for the above compound will be
[A]
214 nm
[B]
217 nm
[C]
222 nm
[D]
227 nm
(5)
The possible transitions for water molecule in UV-visible region are
[A]
σ →σ *
[B]
n→π *, π→π *
[C]
σ→σ *, n→π *
[D]
n → σ*
(6)
Choose the right statement
[A]
Homoannular diene is called as transoid
[B]
Cisoid shows less intense absorption
[C]
The base value of transoid is 214 nm
[D]
Exocyclic double bond causes a bathochromic shift of 30 nm
Answer: The base value of transoid is 214 nm
(7)
The increment for α alkyl substitution on enones is
[A]
18
[B]
12
[C]
10
[D]
5
(8)
The λmax in α,β-unsaturated acids can be determined by
[A]
Wood ward fieser
[B]
Nielsen rules
[C]
Fieser-kuhn rules
[D]
All of the above
(9)
The number of double bonds present in carotene is
[A]
5
[B]
10
[C]
11
[D]
18
(10)
Select one of the statements that is CORRECT regarding enones.
[A]
n→π * is forbidden
[B]
π →π * is forbidden
[C]
Both n→π * and π →π * are forbidden
[D]
n→π * is forbidden but π →π * is allowed
Answer: n→π * is forbidden
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