Question # 1

Benzene is obtained by fractional distillation of

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Heavy oil

Anthracene oil

Middle oil

Light oil

The reaction-method that does not give an alkane is

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Catalytic hydrogenation of alkanes

Wurtz reaction

Hydrolysis of alkyl magnesium bromide

Dehydrohalogenation of an alkyl halide

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

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Two

Three

Four

None

All C - H bond lengths of benzene ring is

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1.07A°

1.09A°

1.08A°

None

The molecule of ethane possess which hybrization

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sp³

sp²

sp

sp²d

The stability of acromatic compounds decreases with ------- in the no. of its resonance structure

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Decrease

Increase

Remain constant

Partially decreases

Hybridization in alkanes is:

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sp

sp²

sp³

dsp²

Hydrocarbon which is liquid at room temperature is

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Pentane

Butane

Propane

Ethane

When methane reacts with Cl₂in the presence of diffused light the products obtained are

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Chloroform only

Carbon tetrachloride only

Chloromethane and dichloromethane

Mixture of a, b, c

Polymerization of ethane take place at pressure of 100 atm and a temperature of

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200°C

400°C

600°C

800°C

In which one of the following compound rings are not fused together at ortho positions

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Phenanthrene

Naphthalene

Diphenyemethane

Anthracene

The correct order of reactivity of halogens with alkanes is

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l₂> Br₂> Cl₂> F₂

l₂> Cl₂> F₂> Br₂

F₂> Cl₂> l₂> Br₂

F₂> Cl₂> Br₂> l₂

Which can be used for dehydration of alcohol

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P₄O₁₀

H₂SO₄

H₃PO₄

All of them

The method involved for electrolysis of Na or K salts of carboxylic acids

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Sabatier's sendrens reaction

Kolbe's method

Clemmensen

Wolf kishner reduction

Benzene was discovered by Michael Faraday's in

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1824

1825

1826

1827

The hydrocarbon used for polymerization is

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Alkanes

Alkenes

Alkynes

All of above

The saturated hydrocarbons usually end with suffix ______

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Ane

Ene

Yne

Oic

The method used only for the production of symmetrical alkanes

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Kolb's method

Clemmenen

Cannizzaro

Wolf kishner

Introduction of a second methyl group in methylbenzene will give how many isomeric dimethyllenzenes

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2

1

3

4

Alkanes containing carbon C₁₈ownwards are

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Gases

Liquids

Waxy solids

Solids

Vinyl acetylene combines with HCI to form

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Poly acetylene

Benzene

Chloroprene

Divinylacetylene

Physical properties of alkanes increase with increase of all physical constants except

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Boiling points

Melting points

Density

Solubility

Toluene is also called

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Hydroxyl benzene

Methyl benzene

ethyl benzene

None

The addition of unsymmetrical reagent to an unsymmetrical alkene is in accordance with the rule

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Hund's rule

Markowvikov's rule

Pauli's exclusion principle

Auf ban principle

Benzene does not undergo

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Substitution reaction

Addition reaction

Oxidation reaction

Elimination reaction

Free radical mechanism of halogenation of alkanes follow step:

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Initiation

Propagation

Termination

All of these

Kolb's method of alkanes production, is actually

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Hydrolysis

Catalysis

Electrolysis

Hydrogenation

Preparation of vegetable ghee involves:

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Halogenation

Hydrogenation

Hydroxylation

Dehydrogenation

During reaction of O₂and alkenes, a product:

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Glycol

Epxide

Halohydrin

Ethylene glycol

A single benzene ring can have ______ ortho position maximally

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One

Two

Three

Four

Alkyne is :

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CH_3-CH₃

CH₄

CH₂₌CH₂

C₂H₂

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