General Methods of Preparation, Properties, and Reactions NEET Questions

Organic Chemistry - Hydrocarbons

General Methods of Preparation, Properties, and Reactions MCQ Questions


13.
Iodination of alkanes is reversible. To make it irreversible, what is added?
A.
An oxidizing agent like HIO3 or HNO3
B.
A reducing agent
C.
Water
D.
A base like NaOH
😑 View Answer Rough Work Error
ANSWER :
A. An oxidizing agent like HIO3 or HNO3
14.
The mechanism of halogenation of alkanes proceeds via:
A.
Nucleophilic substitution
B.
Free radical chain mechanism
C.
Electrophilic addition
D.
Carbocation intermediate
😑 View Answer Rough Work Error
ANSWER :
B. Free radical chain mechanism
15.
During chlorination of methane, which step represents the initiation step?
A.
•CH3 + Cl-Cl → CH3Cl + Cl•
B.
CH4 + Cl• → •CH3 + HCl
C.
Cl• + Cl• → Cl2
D.
Cl-Cl → 2Cl• (in presence of hv)
😑 View Answer Rough Work Error
ANSWER :
D. Cl-Cl → 2Cl• (in presence of hv)
16.
Which is NOT a chain termination step in chlorination of methane?
A.
CH4 + Cl• → •CH3 + HCl
B.
•CH3 + Cl• → CH3Cl
C.
•CH3 + •CH3 → CH3-CH3
D.
Cl• + Cl• → Cl2
😑 View Answer Rough Work Error
ANSWER :
A. CH4 + Cl• → •CH3 + HCl
17.
Formation of ethane as a by-product during chlorination of methane is explained by:
A.
Reaction of CH4 with another CH4
B.
Coupling of two methyl radicals (termination step)
C.
Reaction of CH3Cl with CH4
D.
Decomposition of HCl
😑 View Answer Rough Work Error
ANSWER :
B. Coupling of two methyl radicals (termination step)
18.
Complete combustion of methane gives:
A.
CO and H2O
B.
CH3OH and H2O
C.
CO2 and H2O with evolution of heat
D.
Carbon black and H2O
😑 View Answer Rough Work Error
ANSWER :
C. CO2 and H2O with evolution of heat