Question # 1

Some orchids attracts bees for pollination by producing.

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alkanes

almenes

alkynes

all the above.

The molecular formula of the first three members of the alkane hydrocarbons are CH_4,C₂H₆ and C₃H₈. What is the molecular formula for the eight alkane member, octane, which is found is petrol?

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C₈H₈

C₈H₁₆

C₈H₁₈

C₈H₂₀

Alkanes are least reactive compounds because they are.

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Saturated hydrocarbons.

Unsaturated hydrocarbons.

Both a and b

None of the above.

Which gas creates suffocation and causes death?

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CO

CO₂

SO₃

SO₂

Molecular formula of butyne is .

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C₄H₆

C₃H₄

C₄H₇

C₄H₈

The general formula of alkynes is

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C_nH_2n

C_nH_2n+2

C_nH_2n-2

C_n H_2n+1

Which is simplest alkane?

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CH₄

C₂H₈

C₂H₂

C₂H₄

The order of reactivity of hydrogen halides with alkenes is.

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HI>HBr

HBr>HI

HCl>HBr

HBr < HCl

Which is present 85% in natural gas?

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Ethane

Propane

Methane

Butane

General formula of alkynes is:

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C_nH_n

C_nH_2n

C_nH_2n+2

C_nH_2n-2

Boiling point of alcohol in centigrade is.

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68

78

118

128

Which one of the following is gas at room temperature:

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C2H6

C6H14

C6H6

C8H18

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

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10%

20%

30%

40%

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