Nature of C-X Bond; Mechanisms of Substitution Reactions NEET Questions

Organic Chemistry - Organic Compounds Containing Halogens

Nature of C-X Bond; Mechanisms of Substitution Reactions MCQ Questions


7.
Which factor is responsible for haloalkanes being polar molecules?
A.
Difference in electronegativity between C and X
B.
Equal electronegativity of C and X
C.
Presence of lone pairs on halogen only
D.
sp³ hybridization of carbon
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ANSWER :
A. Difference in electronegativity between C and X
8.
The C-Cl bond length in chlorobenzene is 169 pm while in chloromethane it is 178 pm. This is because:
A.
Chlorobenzene has weaker C-Cl bond
B.
C in chlorobenzene is sp² hybridised with greater s-character
C.
Resonance lengthens the bond
D.
Phenyl group repels chlorine
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ANSWER :
B. C in chlorobenzene is sp² hybridised with greater s-character
9.
As we move down the halogen group, the C-X bond strength:
A.
Decreases due to increased bond length
B.
Remains constant
C.
Increases due to greater electronegativity
D.
Increases due to better orbital overlap
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ANSWER :
A. Decreases due to increased bond length
10.
Which of the following has the shortest C-X bond?
A.
Ethyl chloride (CH₃CH₂-Cl)
B.
Vinyl chloride (CH₂=CH-Cl)
C.
tert-Butyl chloride ((CH₃)₃C-Cl)
D.
Methyl chloride (CH₃-Cl)
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ANSWER :
B. Vinyl chloride (CH₂=CH-Cl)
11.
Which mechanism is followed by the reaction: CH₃Cl + OH⁻ → CH₃OH + Cl⁻?
A.
E1 (Unimolecular elimination)
B.
SN1 (Unimolecular nucleophilic substitution)
C.
SN2 (Bimolecular nucleophilic substitution)
D.
E2 (Bimolecular elimination)
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ANSWER :
C. SN2 (Bimolecular nucleophilic substitution)
12.
The order of reactivity of alkyl halides in SN2 reaction is:
A.
2° > 1° > Methyl > 3°
B.
1° > Methyl > 2° > 3°
C.
3° > 2° > 1° > Methyl
D.
Methyl > 1° > 2° > 3°
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ANSWER :
D. Methyl > 1° > 2° > 3°