Question # 1

Incomplete combustion of alkanes produces.

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Carbon dioxide only

Carbon monoxide only

Carbon monoxide and carbon black

Carbon dioxide and carbon black

One of the hydrocarbons reacts with one mole of hydrogen to form a saturated hydrocarbon. What formula could be of the X.

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C₃H₈

C₆H₁₂

C₄H₁₀

C₇H₁₆

Dehalogenation of Tetrahalides takes place in the presence of .

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K

Mg

Na

Zn dust

In which one of the following is a substitution reaction?

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Halogenations of alkynes

Halogenations of alkenes

Halogenations of alkanes

Bromination of alkenes

Ethen is prepared by heating a mixture of ethanol and excess of concentrated sulphuric acid at:

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150°C

180°C

250°C - 300°C

400°C - 450°C

Dehydrohalogenation takes place in the presence of .

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NaOH aqueous

Alcoholic KOH

Aqeous KOH

Alcoholic NaOH

Which gas creates suffocation and causes death?

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CO

CO₂

SO₃

SO₂

Chloroform is used for

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Anesthesia

Fever

Link

Toys

Benzene is formed by the polymerization of.

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Alkene

Alkane

Acetylene

Methane.

Which hydrocarbon decolorizes the pink colour of acidic solution of potassium permanganate?

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CH₄

C₂H₄

C₂H₆

C₂H₅

Oxidation of ethene with KMnO₄produces.

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oxalic acid

glyoxal

ethene glycol

Propene glycol

How trace amount of acetylene present in the coat gas.

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0.06%

0.07%

0.08%

0.09%

Which one of these is a saturated hydrocarbon?

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C₂H₄

C₃H₆

C₄H₈

C₅H₁₂

Which is the substitution reaction in the following?

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Halogenation of alkenes

Halogenation of alkynes

Bromination of alkene

Halogenation of alkanes

When bromine water is added to acetylene its red-brown colour is changed into:

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red

green

violet

discharged

Ethylene is present is natural gas sometimes to the extent of .

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10%

20%

30%

40%

Boiling point of alcohol in centigrade is.

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68

78

118

128

Which is present 85% in natural gas?

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Ethane

Propane

Methane

Butane

Which is simplest alkane?

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CH₄

C₂H₈

C₂H₂

C₂H₄

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10th Class Chemistry Chapter 12 Hydrocarbons English Medium KPK Boards Online Mcqs MCQs With Answers

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