Question # 1

The general formula of alkane is

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C_nH_2n+2

C_nH_n

C_nH_2n

C₂H_2n-1

Which one of the following gases is used for artificial ripening of fruits

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Ethane

Ethyne

Methane

Propane

Sp³hybird orbitals are oriented at an angle of

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107.5°

108.5°

109.5°

103.5°

Which of the following reaction is characteristic of benzene

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Electrophilic substitution reaction

Reduction

Oxidation

Ozonolysis

Which one gives acidic reactions?

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CH₃----C≡C-------CH₃

CH₃-----CH₂-----HC=CH----CH₂

CH₃----CH=CH₂

CH₃-----C≡CH

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2, 3-dimethylbutane

2, 3-methylbutane

2-dimethylbutane

Dimethylbutane

Alkenes normally have ______ geometry

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Tetrachedral

Linear

Planer

None

Most common reactions of benzene and its derivatives are

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electrophilic addition reactions

electrophilic substitution reactions

Nucleophilic addition reactions

Nucleophilic subtitution reactions

Complete combustion of alkane yields

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CO₂+ H₂O

CO₂+ heat

CO + H₂O heat

CO₂+ H₂O + heat

When n-hexane is heated in the presence of Pt at 500°C, it cyclists to give

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Benzene

Cyclohexene

Benzene

Toluene

Vinyl acetylene combines with HCI to form

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Poly acetylene

Benzene

Chloroprene

Divinylacetylene

Substituted phenyl groups are called

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acyl groups

phenyl groups

Aryl groups

Alkyle groups

Marsh gas was the name given to

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Methane

Ethane

Propane

Butane

A single benzene ring can have ______ ortho position maximally

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One

Two

Three

Four

Which reaction is too vigorous to control

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Chlorination

Bromination

Iodination

Fluorination

All C - H bond lengths of benzene ring is

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1.07A°

1.09A°

1.08A°

None

How many isomeric disubtituted products are obtained by the introducing of second group in the ring

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Two

Three

Four

None

Which one of following is not monocyclic aromatic hydrocarbon

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Benzaldehyde

Benzoic acid

Benzene sulfonic acid

Biphenyl

Boiling point of n-butane is:

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-102°C

-75°C

-55°C

55°C

Benzene does not undergo polymerization and it is also resistant to

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Reduction

Oxidation

Alkylation

Ozonolysis

When alkyl is treated with chlorine in the presence of sunlight

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1,3 dichloroproduct is formed

1,4 dichloro product is formed

1,3,5 trichloro product is formed

Only alkyl group is substituted

Benzene is obtained by fractional distillation of

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Heavy oil

Anthracene oil

Middle oil

Light oil

Benzene has a -------- structure

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Pentagonal

Hexagonal

Heptagonal

Tetragonal

Which is the used as test for the presence of alkenes

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Reaction of cold dilute alkaline KMnO₄

Combustion

Polymerization

Catalytic hydrogenation

Eletronegativity difference in C-C bond in alkanes is:

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Zero

Double

Half

4.0

During nitration of benzene, the active nitrating agent is

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NO3

NO2+

NO2-

HNO3

Alkyl halides when reduced with nascent hydrogen in the presence of Zn + HCI, are converted to

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Alkynes

Alkenes

Alkanes

Alcohol

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4-methyl pentene

2-methyle-1-butene

2-methyl propane

None of the above

Mustard gas is a

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Gas

High boiling speed

High melting liquid

Steam

The electron releasing effect of methyl group is significant and it makes ring a good

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Electrophilic

Nucleophilic

Nucleophobic

Hydrophobic

The order of reactivity of halogen acids towards alkenes

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HCl > HBr > Hl

HBr > HCl > HI

HCl > HBr

HI > HBr > HCl

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