UV-Visible Multiple Choice Spectroscopy Questions and Answers | UV-Visible MCQs

Questions
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

Answer:200-800 nm
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*

Answer:n→s*, s→s*

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3 On increasing pH, phenol shows
A Q,R
B P,R
C Q,S
D P,S

Answer: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

Answer:222 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*

Answer: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

Answer:10
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

Answer:Wood ward fieser
9 The number of double bonds present in carotene is
A 5
B 10
C 11
D 18

Answer:11
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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