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


13.
Which of the following is shown using full-headed (regular) curved arrows?
A.
Movement of a single electron
B.
Formation of a covalent bond from atoms
C.
A radical reaction step
D.
Movement of an electron pair
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ANSWER :
D. Movement of an electron pair
14.
In the cleavage CH3-Z → CH3:- + Z+, the carbon species formed is:
A.
Carbocation
B.
Carbanion
C.
Free radical
D.
Carbene
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ANSWER :
B. Carbanion
15.
Which of the following is NOT a characteristic of heterolytic cleavage?
A.
Forms two neutral radicals
B.
Movement of electron pair
C.
Common in polar bonds
D.
Forms charged species
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ANSWER :
A. Forms two neutral radicals
16.
During homolytic cleavage of R-X bond (where R is alkyl), each atom retains:
A.
Both electrons of the bond
B.
No electrons
C.
One electron from the shared pair
D.
Three electrons each
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ANSWER :
C. One electron from the shared pair
17.
The peroxide bond (O-O) in benzoyl peroxide undergoes which type of cleavage on heating?
A.
Heterolytic
B.
Coordinate cleavage
C.
Ionic
D.
Homolytic
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ANSWER :
D. Homolytic
18.
In which case is heterolytic cleavage NOT preferred?
A.
Polar solvent
B.
Non-polar bond in non-polar solvent
C.
Polar bond
D.
Aqueous medium
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ANSWER :
B. Non-polar bond in non-polar solvent