Question # 1

Alkynes are also called.

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Olefine

Ethene

Paraffins

Acetylenes

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

Traces of acetylene are present to coal gas about.

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0.06 %

0.08%

1.1 %

90%

The reduction of alkyl halides takes place in the presence of

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Zn/HCl

Na/HCl

Mg/HCl

Cu/HCl

Dehydration means removal of.

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Water

Halogen

Hydrogen

All above.

Dehalogenation of Tetrahalides takes place in the presence of .

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K

Mg

Na

Zn dust

The end product of oxidation of acetylene is .

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Oxalic acid

Glyoxal

Glycol

None of these

Marsh gas is mostly :

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ethane

methane

butane

propane

Which gas creates suffocation and causes death?

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CO

CO₂

SO₃

SO₂

If an organic compound has 4 carbon atoms, all singly bonded, it will have the following characteristics except one.

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It will be saturated hydrocarbon

It will hav 8 hydrogen atoms

Its name will be n-butane.

It will be least reactive.

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

Which are called paraffines?

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Alkyle

Alkynes

Alkenes

Alkanes

Boiling point of alcohol in centigrade is.

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68

78

118

128

Condensed formula of ethane is

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C₃Cl₈

C₂Cl₆

H₃CCH₃

None of these

Alkanes are least reactive compounds because they are.

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Saturated hydrocarbons.

Unsaturated hydrocarbons.

Both a and b

None of the above.

Marsh gas is mostly consisted of.

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Butane

Propane

Ethane

Methane

Which hydrocarbon has no effect on an aqueous solution of bromine.

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CH₄

C₁₀H₂₀

C₂H₂

C₂H₄

The alkanes consisting of C₅ to C₁₀

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gases

liquids

solid

plasma

In dry cleaning, which chemical is used.

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Chloroform

Carbon tetachloride

Ecetaldehyde

Ethanol

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