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


1.
Heterolytic cleavage of a covalent bond results in the formation of:
A.
Two free radicals
B.
A pair of ions (cation and anion)
C.
Two neutral atoms
D.
A carbocation and a free radical
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ANSWER :
B. A pair of ions (cation and anion)
2.
Homolytic cleavage of a covalent bond produces:
A.
Carbocation and carbanion
B.
Carbocation and anion
C.
Cation and anion
D.
Two free radicals
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ANSWER :
D. Two free radicals
3.
Which of the following arrows represents the movement of a single electron in homolytic cleavage?
A.
Full-headed curved arrow
B.
Half-headed (fish-hook) curved arrow
C.
Straight arrow
D.
Double-headed arrow
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ANSWER :
B. Half-headed (fish-hook) curved arrow
4.
Which conditions typically favor homolytic bond cleavage?
A.
Heat or UV light
B.
Polar solvents
C.
Strong acids
D.
Aqueous medium
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ANSWER :
A. Heat or UV light
5.
The cleavage of CH3-Br to form CH3+ and Br- is an example of:
A.
Homolytic cleavage
B.
Free radical formation
C.
Heterolytic cleavage
D.
Polymerization
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ANSWER :
C. Heterolytic cleavage
6.
In homolytic cleavage of Cl-Cl bond, the products are:
A.
Cl+ and Cl-
B.
Cl3- ion
C.
Cl2 molecule
D.
Two Cl atoms (radicals)
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ANSWER :
D. Two Cl atoms (radicals)