Hydrocarbons – Old Year Questions

1. Which one of the following is the correct sequential order in which these appeared under simulated primitive earth conditions?

(a) Methane, Hydrogen Cyanide, Nitrile, Amino Acid
(b) Hydrogen Cyanide, Methane, Nitrile, Amino Acid
(c) Amino Acid, Nitrile, Hydrogen Cyanide, Methane
(d) Nitrile, Amino Acid, Methane, Hydrogen Cyanide

[I.A.S. (Pre) 1994]


2. Which is the fundamental element of all organic compounds?

(a) Nitrogen
(b) Oxygen
(c) Carbon
(d) Brimstone

[56th to 59th B.P.S.C. (Pre) 2015, U.P.U.D.A./L.D.A. (Pre) 2001]


3. In all bio-compounds the most necessary fundamental element is –

(a) Sulphur
(b) Carbon
(c) Oxygen
(d) Nitrogen

[U.P.P.C.S. (Mains) 2015]


4. Which one of the following sets of elements was primarily responsible for the origin of life on the Earth?

(a) Hydrogen, Oxygen, Sodium
(b) Carbon, Hydrogen, Nitrogen
(c) Oxygen, Calcium, Phosphorus
(d) Carbon, Hydrogen, Potassium

[I.A.S. (Pre) 2012]


5. Which one of the following is the correct sequence in increasing order of molecular weights of the hydrocarbons?

(a) Methane, Ethane, Propane and Butane
(b) Propane, Butane, Ethane and Methane
(c) Butane, Ethane, Propane and Methane
(d) Butane, Propane, Ethane and Methane

[I.A.S. (Pre) 2001]


6. A hydrocarbon in which two carbon atoms are joined by a double bond is called an :

(a) Alkane
(b) Alkene
(c) Alkyne
(d) Ionic bond
(e) None of the above/More than one of the above

[63rd B.P.S.C. (Pre) 2017]


7. Which of the following gases is used in cigarette lighters?

(a) Butane
(b) Methane
(c) Propane
(d) Radon

[56th to 59th B.P.S.C. (Pre) 2015]


8. Leakage of which of the following gases had caused the Bhopal Gas Tragedy?

(a) Methyl isocyanate
(b) Carbon monoxide
(c) Nitric oxide
(d) Sulphur dioxide

[Uttarakhand P.C.S. (Pre) 2012]


9. The Bhopal Gas Tragedy was caused due to the leakage of :

(a) Methyl isocyanate
(b) Nitrogen dioxide
(c) Sulphur dioxide
(d) Carbon monoxide

[U.P.P.C.S. (Pre) 2017]


10. When did the Bhopal Gas tragedy happen?

(a) 2-3 Dec. 1984
(b) 2-3 Nov. 1984
(c) 2-3 Dec. 1985
(d) 2-3 Nov. 1985

[M.P.P.C.S. (Pre) 2013]


11. From the decomposition of which of the following printing ink is formed :

(a) Acetylene
(b) Methane
(c) Carbon tetrachloride
(d) Benzene

[Jharkhand P.C.S. (Pre) 2003]


12. Methane gas producing field is –

(a) Wheat field
(b) Paddy field
(c) Cotton field
(d) Groundnut f eld

[U.P.P.C.S. (Pre) 2014]


13. Which of the following is correctly matched?

List-I List – II
1. Biogas Insecticide
2. Electrocardiography Heart disorder
3. D.D.T Cow-dung
4. Nicotine Tobacco

Code :

(a) 1, 2 and 4
(b) 2, 3 and 4
(c) 2 and 3
(d) 2 and 4

[U.P. Lower Sub. (Pre) 2002]


14. Which one of the following chemicals helps in fruit ripening?

(a) Ethephon
(b) Atrazine
(c) Isoproturan
(d) Malathion

[U.P. U.D.A./L.D.A. (Pre) 2010, U.P.P.C.S. (Pre) 2005]


15. Which of the following chemicals is used for ripening?

(a) Sodium Chloride
(b) Calcium Carbide
(c) Potassium Chloride
(d) None of the above

[U.P.P.C.S. (Mains) 2011]


16. Calcium carbide is used for artificial ripening of green fruits because it produces :

(a) Methylene
(b) Auxin
(c) Acetylene
(d) Florigen

[R.A.S./R.T.S. (Pre) 2016]


17. Fruit ripening is promoted by which of the following?

(a) Carbon dioxide
(b) Sulphur dioxide
(c) Nitrogen
(d) Ethylene

[U.P.R.O./A.R.O (Pre) 2014]


18. Which of the following gas mixtures is used in welding gas?

(a) Acetylene and Hydrogen
(b) Oxygen and Acetylene
(c) Hydrogen and Oxygen
(d) Hydrogen and Helium

[Uttarakhand P.C.S. (Pre) 2005]


19. Gases used in welding are :

(a) Oxygen and hydrogen
(b) Oxygen and nitrogen
(c) Oxygen and acetylene
(d) Hydrogen and acetylene
(e) None of the above/More than one of the above

[63rd B.P.S.C. (Pre) 2017]


20. Consider the following statements about acetylene :
1. It is used in the welding industry.
2. It is a raw material for preparing plastics.
3. It is easily obtained by mixing silicon carbide and water.
Of these statements

(a) 1 and 2 are correct
(b) 1 and 3 are correct
(c) 2 and 3 are correct
(d) 1, 2 and 3 correct

[I.A.S. (Pre) 1998]


21. For benzene which of the following statements is true?

(a) It has six sigma and six pi bonds
(b) It has twelve sigma and six pi bonds
(c) It has twelve sigma and three pi bonds
(d) It has six sigma and three pi bonds
(e) None of the above.

[Chhattisgarh P.C.S. (Pre) 2014]


22. Numbers of sigma and pi bonds in benzene are:

(a) 3, 3
(b) 3, 6
(c) 12, 3
(d) 12, 6
(e) None of the above / More than one of the above

[66th B.P.S.C. (Pre) 2020]