Question # 1

Substituted phenyl groups are called

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acyl groups

phenyl groups

Aryl groups

Alkyle groups

Toluene is also called

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Hydroxyl benzene

Methyl benzene

ethyl benzene

None

The alkynides are used for the ----------- of alkynes

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Pxperation

Purification

Seperation

All of above

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

The difference between amount of heat actually released and that of calculated is called

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Bonding energy

Activation energy

Resonance energy

Transition energy

The three alternate single and double bonds in the benzene ring are called

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Conjugate bonds

Resonating bonds

Both A and B

None of above

The C-C bond angles in benzene ring are

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119°

120°

121°

None

Hydrocarbons are divided into aliphatic, alicyclic and aromatic which structure among the following show an alicyclic hydrocarbon

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A six membered ring containing one double bond called

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Cyclohexene

Cyclohexane

Cyclohexadiene

None

B-B'-dichloroethyl sulphide is commonly known as

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Mustard gas

Laughing gas

Phosgene gas

Bio gas

The molecule of ethane possess which hybrization

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sp³

sp²

sp

sp²d

Which of the following possesses the highest melting point?

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Chlorobenzene

0-Dichlorobenzene

m-Dichlorobenzene

p-Dichlorobenzene

The hydrocarbon used for polymerization is

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Alkanes

Alkenes

Alkynes

All of above

Which one gives acidic reactions?

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CH₃----C≡C-------CH₃

CH₃-----CH₂-----HC=CH----CH₂

CH₃----CH=CH₂

CH₃-----C≡CH

Alkenes normally have ______ geometry

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Tetrachedral

Linear

Planer

None

Octane number is zero for

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n-Heptane

Isooctane

n-Hexane

Isoheptane

In Friedal-Craft's alkylation besides AlCl3 the other reactants are

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C6H6 + NH3

C6H6 + NH4

C6H6 + CH3Cl

C6H6 + CH3COCl

Which class of compound is more reactive

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Alkane

Alkene

Alkyne

None

During reaction of O₂and alkenes, a product:

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Glycol

Epxide

Halohydrin

Ethylene glycol

The electrophile in aromatic sulphonation is

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H₂SO₄

HSO₄

SO₃

SO₃⁺

Aromatic hydrocarbons are the derivatives of

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Normal series of paraffins

Alkene

Benzene

Cyclohexane

The method used only for the production of symmetrical alkanes

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Kolb's method

Clemmenen

Cannizzaro

Wolf kishner

Preparation of vegetable ghee involves

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Halogenations

Hydrogenations

Hydroxylation

Dehydrogenations

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

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Decrease

Increase

Remain constant

Partially decreases

Incomplete oxidation of alkanes yields

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CO₂& carbon black

CO₂+ heat

CO and carbon black

CO + heat

Substitution of halogen in the benzene ring requires catalyst

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AlCl₃

FeCl₃

SiO₂

Organo - nickel

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

"Each different compound should have a different name" was published by IUPAC system of nomenclature in

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1892

1830

1947

1979

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

Nitroalkane are used in

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Fuel

Solvents

Organic synthesis

All of them

β-β- dichloroethyle sulphide is commonly known as:

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Mustared gas

Laughing gas

Phosgene gas

Bio gas

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ECAT Chemistry Chapter 19 Aliphatic Hydrocarbons Online Test MCQs With Answers

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