Hydrocarbons — Homi Bhabha Exam Chemistry MCQs with Solutions
Free Homi Bhabha Exam Chemistry Hydrocarbons MCQs with step-by-step solutions (7 questions). Part of Carbon & Its Compounds. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Hydrocarbons · medium · theory
A compound made up of only carbon and hydrogen is called a:
A. hydrocarbon ✓ Correct
B. carbohydrate
C. carbonate
D. oxide
Solution: Hydrocarbons contain only carbon and hydrogen atoms (e.g. methane, ethane).
Q2 — Hydrocarbons · medium · theory
The simplest hydrocarbon, the main component of natural gas, is:
A. ethene (C₂H₄)
B. methane (CH₄) ✓ Correct
C. ethyne (C₂H₂)
D. ethane (C₂H₆)
Solution: Methane, CH₄, is the simplest hydrocarbon.
Q3 — Hydrocarbons · hard · theory
Hydrocarbons that contain only single bonds between carbon atoms are called:
A. saturated (alkanes) ✓ Correct
B. unsaturated (alkenes)
C. unsaturated (alkynes)
D. aromatic
Solution: Saturated hydrocarbons (alkanes) have only C–C single bonds.
Q4 — Hydrocarbons · hard · theory
A hydrocarbon containing a carbon–carbon double bond is:
A. propane (C₃H₈)
B. ethane (C₂H₆)
C. methane (CH₄)
D. ethene (C₂H₄) ✓ Correct
Solution: Ethene has a C=C double bond, making it an unsaturated alkene.
Q5 — Hydrocarbons · hard · theory
Ethyne (acetylene), used in welding torches, contains a carbon–carbon:
A. double bond
B. triple bond ✓ Correct
C. single bond
D. ionic bond
Solution: Ethyne (C₂H₂) has a C≡C triple bond.
Q6 — Hydrocarbons · medium · theory
When a hydrocarbon burns completely in plenty of air, the products are:
A. only carbon
B. carbon monoxide and hydrogen
C. carbon dioxide and water ✓ Correct
D. ammonia and water
Solution: Complete combustion of a hydrocarbon gives CO₂ and H₂O with the release of heat.
Q7 — Hydrocarbons · medium · theory
CNG and LPG, used as fuels, are mainly mixtures of:
A. metal oxides
B. salts
C. acids
D. hydrocarbons ✓ Correct
Solution: CNG (mostly methane) and LPG (propane/butane) are hydrocarbon fuels.