Covalent Bond Fission -Homolytic and Heterolytic, Free Radicals, Carbocations and Carbanions,... NEET Questions

Organic Chemistry - Some Basic Principles of Organic Chemistry

Covalent Bond Fission -Homolytic and Heterolytic, Free Radicals, Carbocations and Carbanions,... MCQ Questions


7.
Which type of bond is most likely to undergo heterolytic fission?
A.
Non-polar covalent bond
B.
Pure covalent bond
C.
Polar covalent bond
D.
Coordinate bond only
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ANSWER :
C. Polar covalent bond
8.
Reactions proceeding through heterolytic bond cleavage are known as:
A.
Radical reactions
B.
Pericyclic reactions
C.
Concerted reactions
D.
Polar (ionic) reactions
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ANSWER :
D. Polar (ionic) reactions
9.
In the reaction CH3-Cl → CH3• + Cl• (under UV light), the type of bond cleavage is:
A.
Homolytic
B.
Heterolytic
C.
Both heterolytic and homolytic
D.
No cleavage occurs
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ANSWER :
A. Homolytic
10.
After heterolytic cleavage of a C-Br bond, if Br takes both electrons, the carbon will have:
A.
Octet of electrons
B.
Sextet of electrons and positive charge
C.
Lone pair and negative charge
D.
8 electrons and negative charge
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ANSWER :
B. Sextet of electrons and positive charge
11.
Which species is NOT formed via heterolytic cleavage?
A.
Carbocation
B.
Carbanion
C.
Free radical
D.
Both cation and anion
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ANSWER :
C. Free radical
12.
Heterolytic cleavage of C-Z bond where Z is more electronegative gives:
A.
Carbocation + Z-
B.
Carbanion + Z+
C.
Free radicals
D.
Both A and B are possible
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ANSWER :
A. Carbocation + Z-