Question # 1

Which is the substitution reaction in the following?

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Halogenation of alkenes

Halogenation of alkynes

Bromination of alkene

Halogenation of alkanes

Some orchids attracts bees for pollination by producing.

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alkanes

almenes

alkynes

all the above.

By which process alkenes are prepared from alcohols:

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Dehelogenation

Dehydrogenation

Dehydration

Dehydro-halogenation

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

A hydrocarbon has molecular formula C₈H₁₄. What is the molecular formula of the next number of the same homologous series.

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C₉H₁₈

C₉H₁₆

C₉H₂₀

C₉H₁₂

How many percent of natural gas is consisted of methane.

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60%

70%

80%

85%

Alkynes are also called.

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Olefine

Ethene

Paraffins

Acetylenes

Boiling point of alcohol in centigrade is.

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68

78

118

128

Ethyne is oxidized by alkaline KMnO₄ then ....... hydroxyl group add to the triple bond.

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Two

Three

Four

Five

Which one is the formula of chloromethane.

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CH₂Cl₂

CCl₄

CHCl₃

CH₃Cl

The order of reactivity of hydrogen halides with alkenes is.

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HI>HBr

HBr>HI

HCl>HBr

HBr < HCl

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

How trace amount of acetylene present in the coat gas.

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0.06%

0.07%

0.08%

0.09%

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

Dehydrohalogenation take place in the presence of.

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Aqueous NaOH

Alcoholic KOH

Aqueous KOH

Alcoholic NaOH

Which is simplest alkane?

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CH₄

C₂H₈

C₂H₂

C₂H₄

Traces of acetylene are present to coal gas about.

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0.06 %

0.08%

1.1 %

90%

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

Dehydrohalogenation of vicinal-dihalides take place in the presence of.

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NaOH

KOH

NaCl

None of these

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