Organic Compounds Important MCQs with Answers

Class 12 Chemistry Chapter Organic compounds important multiple choice questions with answers are as follow:

1. The process in which an organic molecule is synthesized from the small and cheap readily available molecules is known as:

a) Fractional distillation

b) Distillation

c) Total synthesis

d) Partial synthesis

Answer:

c) Total synthesis

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2. Benzene and Toluene is obtained from:

a) Crude oil

b) Coal tar

c) Carbon gas

d) Coke

Answer:

b) Coal tar

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3. The simplest buckyball is:

a) C50

b) C60

c) C70

d) C40

Answer:

b) C60

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4. The class sulphone is represented by which of the following functional group:

a) R2SO

b) R2S

c) R2SO2

d) RSH

Answer:

C) R2SO2

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4. Ethyl benzoate is:

a) an alcohol

b) an ether

c) an ester

d) an aldehyde

Answer:

 c) an ester

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5. Coal gas mainly consists of which of the following:

a) Methane

b) ammonia

c) Carbon dioxide

d) Hydrogen sulphide

Answer:

a) Methane

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6. Carbon has a unique ability to form long chains. This property of self-linking of carbon is known as:

a) Polymerization

b) Condensation

c) Cyclization

d) Catenation

Answer:

d) Catenation

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7. Carbon tetrachloride, also known as tetrachloromethane is an organic compound that is used as:

a) Lubricant

b) Oxidant

c) Solvent

d) Plastic

Answer:

c) Solvent

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8. When CO2 is passed through lime water it turns milky due to the formation of:

a) Ca (OH)2

b) CaCO3

c) CuSO4

d) Ca (OH)2.5H2O

Answer:

b) CaCO3

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9. On heating an organic compound in the presence of CuO, the hydrogen is oxidized to:

a) CH2O

b) H2

c) H2O2

d) H2O

Answer:

d) H2O

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10. Which reagent is used for the detection of Sulphur in an organic compound?

a) Lead sulphate

b) Lead acetate

c) Lead sulphide

d) Ferrous sulphate

Answer:

b) Lead acetate

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11. When AgNO3 solution is added to an aqueous solution of AgX , deep yellow ppt. are formed which are insoluble in NH4OH. It shows the presence of:

a) Fluorine

b) Bromine

c) Chlorine

d) Iodine

Answer:

d) Iodine

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12. Which of the following is used in the preparation of Lassaigne’s solution:

a) CuO

b) Mg

c) Na

d) Pb

Answer:

c) Na

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13. If a molecule contains more than one functional group, it is known as:

a) Derivative

b) Polyfunctional

c) Heterocyclic

d) Isomer

Answer:

b) Polyfunctional

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14. In Organic compounds carbon atoms form:

a) Ionic bond

b) Covalent bond

c) Hydrogen bonding

d) All the above

Answer:

b) Covalent bond

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15. When water vapours are passed over white anhydrous copper sulphate, which colour is formed due to the formation of CuSO4.5H2O?

a) White

b) Deep blue

c) Yellow

d) Brown

Answer:

b) Deep blue

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