Common Types of Organic Reactions(Substitution, Addition, Elimination, and Rearrangement) NEET Questions

Organic Chemistry - Some Basic Principles of Organic Chemistry

Common Types of Organic Reactions(Substitution, Addition, Elimination, and Rearrangement) MCQ Questions


1.
In a substitution reaction, an atom or group in a molecule is replaced by:
A.
An electron pair only
B.
A double bond
C.
Another atom or group
D.
A pi bond
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ANSWER :
C. Another atom or group
2.
The reaction CH3CH2I + KOH(aq) → CH3CH2OH + KI is classified as:
A.
Electrophilic substitution
B.
Free radical substitution
C.
Elimination
D.
Nucleophilic substitution
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ANSWER :
D. Nucleophilic substitution
3.
CH4 + Cl2 → CH3Cl + HCl (in presence of UV light) proceeds via:
A.
Nucleophilic substitution
B.
Electrophilic addition
C.
Free radical substitution
D.
Electrophilic substitution
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ANSWER :
C. Free radical substitution
4.
Nitration of benzene with conc. HNO3 / conc. H2SO4 is an example of:
A.
Electrophilic addition
B.
Electrophilic aromatic substitution
C.
Free radical substitution
D.
Nucleophilic aromatic substitution
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ANSWER :
B. Electrophilic aromatic substitution
5.
Which of the following best represents a nucleophile?
A.
OH⁻
B.
NO2⁺
C.
AlCl3
D.
BF3
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ANSWER :
6.
In the SN1 mechanism, the rate-determining step involves:
A.
Formation of a carbocation by loss of leaving group
B.
Loss of a beta-hydrogen
C.
Concerted bond breaking and bond making
D.
Direct attack of nucleophile on substrate
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ANSWER :