JAMB and WAEC Chemistry questions: Organic compounds

72 questions with answers and explanations. Tap an option to check yourself.

1. Question 1· Organic compounds· WAEC

   Ethanol is produced industrially from sugar by

   • Apolymerisation
   • Bcracking
   • Cfermentation
   • Ddistillation of crude oil

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   Explanation and discussion

2. Question 2· Organic compounds· JAMB

   The octane rating of petrol is improved by increasing the proportion of

   • Abranched-chain alkanes
   • Bstraight-chain alkanes
   • Cwater
   • Dsulphur compounds

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3. Question 3· Organic compounds· WAEC

   The general name for long-chain molecules made by joining many small units is

   • Apolymers
   • Bmonomers
   • Cisomers
   • Dalkanes

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4. Question 4· Organic compounds· JAMB

   The functional group of carboxylic acids is

   • A–CO–
   • B–OH
   • C–CHO
   • D–COOH

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   Explanation and discussion

5. Question 5· Organic compounds· JAMB

   How many structural isomers has C₄H₁₀?

   • A4
   • B3
   • C2
   • D1

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6. Question 6· Organic compounds· WAEC

   What is the general formula of the alkenes?

   • ACₙH₂ₙ
   • BCₙH₂ₙ₊₂
   • CCₙH₂ₙ₋₂
   • DCₙH₂ₙ₊₁OH

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7. Question 7· Organic compounds· JAMB

   The reaction of methane with chlorine requires

   • Aultraviolet light or sunlight
   • Ba nickel catalyst
   • Cwater
   • Ddarkness

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   Explanation and discussion

8. Question 8· Organic compounds· JAMB

   Which of the following compounds will decolourise bromine water?

   • AC₂H₆
   • BC₃H₈
   • CC₃H₆
   • DCH₄

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9. Question 9· Organic compounds· JAMB

   Ethanol oxidised by acidified potassium heptaoxodichromate(VI) first gives

   • Aethane
   • Bethene
   • Cethanal
   • Dmethanol

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10. Question 10· Organic compounds· JAMB

    The products of the complete combustion of ethane are

    • Acarbon and hydrogen
    • Bcarbon(IV) oxide and water
    • Ccarbon(II) oxide only
    • Dethene and hydrogen

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11. Question 11· Organic compounds· JAMB

    In the fermentation of sugar to ethanol, the enzymes are supplied by

    • Athe stomach
    • Bbacteria in milk
    • Cyeast
    • Dsaliva

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12. Question 12· Organic compounds· WAEC

    Fermentation of glucose by yeast produces

    • Aethanoic acid
    • Bmethanol and oxygen
    • Cethanol and carbon dioxide
    • Dethene

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13. Question 13· Organic compounds· WAEC

    Alkenes differ from alkanes because alkenes contain

    • Aan –OH group
    • Bonly single bonds
    • Ca carbon–carbon double bond
    • Da carboxyl group

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14. Question 14· Organic compounds· WAEC

    Polythene is made from ethene by

    • Acondensation polymerisation
    • Baddition polymerisation
    • Csubstitution
    • Dfermentation

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15. Question 15· Organic compounds· WAEC

    Which of the following compounds is an alkanoic acid?

    • ACH₃COOH
    • BCH₃OH
    • CCH₃CHO
    • DC₂H₆

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16. Question 16· Organic compounds· JAMB

    The complete hydrolysis of starch produces

    • Aamino acids
    • Bethanol
    • Cglycerol
    • Dglucose

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17. Question 17· Organic compounds· WAEC

    Which reagent distinguishes ethene from ethane?

    • Asodium chloride solution
    • Blime water
    • Cdilute hydrochloric acid
    • Dbromine water

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18. Question 18· Organic compounds· JAMB

    The general formula of the alkanols is

    • ACₙH₂ₙ₊₁COOH
    • BCₙH₂ₙ
    • CCₙH₂ₙ₊₂
    • DCₙH₂ₙ₊₁OH

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19. Question 19· Organic compounds· JAMB

    The reaction between methane and chlorine in sunlight is

    • Aesterification
    • Baddition
    • Cpolymerisation
    • Dsubstitution

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20. Question 20· Organic compounds· WAEC

    Saponification is the reaction between

    • Aan alkene and hydrogen
    • Ban alcohol and an acid
    • Ca fat or oil and an alkali
    • Da sugar and yeast

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    Explanation and discussion