Electromeric Effect and Electronic Spectroscopy MCQs
which of the following is the correct statement?
(A). Â The Conjugate effect is always same as the (-I) effect
(B). Â The Conjugate effect is always weaker than the (-I) effect
(C). Â The Conjugate effect is always stronger than the (-I) effect
(D). Â None of the mentioned
(E). None of these
Multiple Choice Question Answer: Â c
When the complete transfer of p-electrons take place away from the atom at the requirement of attacking agent it is known as what?
(A). Â (-E) effect
(B). (+I) effect
(C). Â (-I) effect
(D). Â Â (+E) effect
(E). None of these
Multiple Choice Question Answer: Â d
The temporary effect brought into play at the requirement of attacking reagent is ____________
(A). Â Electromeric effect
(B). Â Mesomeric effect
(C). Â Inductive effect
(D). Â Inductomeric effect
(E). None of these
Multiple Choice Question Answer:Â a
Which of the following are the positively charged and electron deficient compounds that have a tendency to form a bond by accepting the electron pair?
(A). Â Homophiles
(B). Â Nucleophiles
(C). Â Electrophiles
(D). Â All of the mentioned
(E). None of these
The incorrect statement about the nucleophiles is ___________
(A). Â They always possess an empty orbital to receive an electron pair
(B). Â They are electron rich
(C). Â They attack electron deficient centres
(D).  Examples are: OH–, NH3, H2O etc
(E). None of these
Multiple Choice Question Answer: Â a
The Lewis acids are the best examples of the nucleophilic reagents.
(A). Â False
(B). Â True
(E). None of these
Multiple Choice Question Answer: Â a
Multiple Choice Question Answer: Â c
The example of lewis base is ____________
(A). Â NH3
(B). Â BF3
(C). Â ZnCl2
(D). Â FeCl2
(E). None of these
Multiple Choice Question Answer:Â a
What does Those groups which are electron repelling and have lesser electron attracting power than hydrogen show?
(A). (+I) effect
(B). Â (-E) effect
(C). Â (-I) effect
(D). Â Â (+E) effect
(E). None of these
Multiple Choice Question Answer: Â a
The molecule that will show the highest dipole moment is ____________
(A). Â CH3F
(B). Â CH3Br
(C). Â CH3Cl
(D). Â CH3I
(E). None of these
Multiple Choice Question Answer: Â a
What is the electronic spectra in the visible range span?
(A). Â 12500-25000 cm-1
(B). Â 25000-50000 cm-1
(C). 25000-72000 cm-1Â Â Â
(D). Â 15000-30000 cm-1
(E). None of these
Multiple Choice Question Answer:Â a
The position of the band of alkanes is _______________
(A). Â 150 nm
(B). Â 185 nm
(C). Â 217 nm
(D). Â 190 nm
(E). None of these
Multiple Choice Question Answer: Â a
_____________ is not an Auxochrome group
(A).  –O2
(B).  –SH
(C).  –OR
(D).  –OH
(E). None of these
Multiple Choice Question Answer: Â a
The shift that leads to the decreased intensity of absorption is _____________
(A). Â Bathochromic
(B). Â Hyperchromic
(C). Â Hypsochromic
(D). Â Hypochromic
(E). None of these
Multiple Choice Question Answer: Â d
The organic compound that shows transition because of the conjugation is _____________
(A). Â Alkenes
(B). Â Conjugated dienes
(C). Saturated aliphatic ketones
(D). Â Alkanes
(E). None of these
Multiple Choice Question Answer:Â b
If %T = 80 the the absorbance is ____________
(A). Â 0.097
(B). Â 0.05
(C). Â 0.5
(D). Â 0.97
(E). None of these
Multiple Choice Question Answer: Â a
The limitation of the Lambert-Beer’s law is ______________
(A). Â Â All of the mentioned
(B). Â Fluorescence of sample
(C). Â Non-monochromatic radiation
(D). Â Scattering of light due to particles
(E). None of these
Multiple Choice Question Answer: Â a
An application of electronic spectroscopy is _____________
(A). Â Detection of impurities
(B). Â Â All of the mentioned
(C). Â Study of kinetics of the chemical reaction
(D). Â Control of purification
(E). None of these
Multiple Choice Question Answer:Â b
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