Electronic Displacement in a Covalent Bond ( Inductive Effect, Electromeric Effect, ... ) NEET Questions

Organic Chemistry - Some Basic Principles of Organic Chemistry

Electronic Displacement in a Covalent Bond ( Inductive Effect, Electromeric Effect, ... ) MCQ Questions


13.
The C-1 in CH₃–CH₂–Cl carries δ+ charge, while C-2 carries:
A.
δδ+ charge (smaller positive than δ+)
B.
δ⁻ charge
C.
No charge
D.
δδ⁻ charge
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ANSWER :
14.
The electromeric effect (E-effect) is:
A.
A temporary effect involving complete transfer of π-electrons in presence of an attacking reagent
B.
A permanent effect involving π-electrons
C.
A permanent effect involving σ-electrons
D.
A delocalisation of σ-electrons into a vacant p orbital
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ANSWER :
15.
In +E (positive electromeric) effect, the π-electrons are transferred:
A.
Away from the attacking reagent
B.
To the atom to which the reagent does NOT attach
C.
To the atom to which the reagent attaches
D.
Equally to both atoms
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ANSWER :
C. To the atom to which the reagent attaches
16.
In –E (negative electromeric) effect, the π-electrons are transferred:
A.
Toward the atom carrying the attacking reagent
B.
There is no electron transfer
C.
To both atoms equally
D.
Away from the atom to which the attacking reagent gets attached
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ANSWER :
D. Away from the atom to which the attacking reagent gets attached
17.
When inductive and electromeric effects operate in opposite directions:
A.
Inductive effect predominates
B.
Electromeric effect predominates
C.
Both cancel out
D.
Resonance dominates
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ANSWER :
B. Electromeric effect predominates
18.
The electromeric effect is shown only when:
A.
There is a polar σ-bond
B.
The molecule contains a lone pair
C.
There is a multiple (π) bond AND an attacking reagent is present
D.
The molecule is heated
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ANSWER :
C. There is a multiple (π) bond AND an attacking reagent is present