RRB NTPC 2025: Organic Chemistry Questions and Answers
The RRB NTPC 2025 exam is a crucial opportunity for aspirants seeking Non-Technical Popular Category (NTPC) positions in Indian Railways. Among the subjects tested, Organic Chemistry plays a significant role in the General Science section. Understanding key concepts such as hydrocarbons, functional groups, reaction mechanisms, and biomolecules is essential for securing high scores.
This guide offers a comprehensive collection of Organic Chemistry MCQs, helping candidates prepare effectively and boost their confidence for the exam.
RRB NTPC 2025 Organic Chemistry Questions
Multiple Choice Questions (MCQs):
1. What is the mechanism called when a chemical reaction occurs through the formation of free radicals?
a) Polar mechanism
b) Free radical mechanism
c) Nucleophilic mechanism
d) Electrophilic mechanism
2. Which of the following is an example of an electrophile?
a) OH⁻
b) NH₃
c) BF₃
d) CN⁻
3. In which type of reaction does a nucleophile attack an electron-deficient molecule?
a) Electrophilic reaction
b) Nucleophilic reaction
c) Free radical reaction
d) Elimination reaction
4. SN¹ reactions are most favorable for which type of halides?
a) Methyl halides
b) Primary halides
c) Secondary halides
d) Tertiary halides
5. Which mechanism involves a two-step process where the reaction rate depends only on the substrate concentration?
a) SN²
b) E1
c) E2
d) E1CB
6. What is the primary use of methane (CH₄)?
a) Making plastics
b) Fuel for heat production
c) Welding
d) Preservative
7. Which gas is used for artificial ripening of fruits?
a) Methane
b) Acetylene
c) Ethylene
d) Propane
8. What is the temperature of an oxy-acetylene flame used in welding?
a) 1500°C
b) 2500°C
c) 3500°C
d) 4500°C
9. Chloroform (CHCl₃) is commonly used as:
a) A fuel
b) An anesthetic
c) A polymer
d) A preservative
10. Which alcohol is used in alcoholic beverages?
a) Methanol
b) Ethanol
c) Propanol
d) Butanol
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11. What is vinegar chemically?
a) 100% acetic acid
b) 10% acetic acid
c) 5% formic acid
d) 20% citric acid
12. Glycerol is used in the production of:
a) Dynamite
b) Plastic
c) Vinegar
d) Methane
13. Which compound is used as a sweetener and in medicines?
a) Naphthalene
b) Glucose
c) Benzene
d) RDX
14. What is the main component of marsh gas?
a) Ethane
b) Methane
c) Propane
d) Butane
15. Which alcohol is also known as wood spirit?
a) Ethanol
b) Methanol
c) Propanol
d) Butanol
16. What is the primary component of natural rubber?
a) Polyethylene
b) Isoprene
c) Vinyl chloride
d) Styrene
17. Which explosive is also known as Research Department Explosive (RDX)?
a) TNT
b) RDX
c) Nitroglycerin
d) Ammonal
18. What is used to lower the freezing point in car radiators?
a) Methanol
b) Ethylene glycol
c) Glycerol
d) Acetone
19. Which compound is used in tear gas?
a) Benzene
b) Chloroacetophenone
c) Naphthalene
d) Formaldehyde
20. What is the chemical name for gammaxene, an insecticide?
a) Benzene hexachloride
b) DDT
c) Chloroform
d) Acetylene
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21. Which compound is used to preserve biological specimens?
a) Methanol
b) Formalin
c) Ethanol
d) Acetone
22. What is used as a fire extinguisher under the name “pyrene”?
a) Carbon tetrachloride
b) Water
c) CO₂
d) Sand
23. Which artificial sweetener is derived from **toluene**?
a) Aspartame
b) Saccharin
c) Sucralose
d) Stevia
24. What is denatured spirit made of?
a) Pure ethanol
b) Ethanol + methanol
c) Ethanol + pyridine
d) Ethanol + water
25. What is the main component of biogas?
a) CO₂
b) Methane
c) Hydrogen
d) Nitrogen
26. Which polymer is formed from vinyl chloride?
a) Polyethylene
b) PVC
c) Teflon
d) Nylon
27. What is the valency of carbon in organic compounds?
a) 2
b) 3
c) 4
d) 5
28. Which scientist first synthesized urea artificially?
a) Lavoisier
b) Wöhler
c) Faraday
d) Dalton
29. Which compound is used in the preparation of dynamite?
a) Glycerol
b) Nitroglycerin
c) TNT
d) RDX
30. What is the hybridization of carbon in benzene?
a) sp
b) sp²
c) sp³
d) dsp²
RRB NTPC 2025 Organic Chemistry Answers
1. b
2. c
3. b
4. d
5. b
6. b
7. c
8. c
9. b
10. b
11. b
12. a
13. b
14. b
15. b
16. b
17. b
18. b
19. b
20. a
21. b
22. a
23.b
24. c
25. b
26. b
27. c
28. b
29. b
30. b
This structured question-answer format ensures clarity and efficiency in preparation. Practice these MCQs to boost your confidence for the RRB NTPC 2025 exam!🚀
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