Question # 1

The electrophile in aromatic sulphonation is

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H₂SO₄

HSO₄

SO₃

SO₃⁺

Which is liquid among the following alkenes?

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Ethane

Propene

Butene

Pentene

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

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Boiling points

Melting points

Density

Solubility

The empirical formula of benzene is determined by

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IR spectra

U.V

Elemental analysis

NMR spectra

Hybridization of each carbon atom in benzene ring is

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sp hybridized

sp²hybridized

sp³

dsp²

The method used only for the production of symmetrical alkanes

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Kolb's method

Clemmenen

Cannizzaro

Wolf kishner

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

The simplest and the parent members of aromatic hydrocarbon is

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Benzene

Toluene

Biphenyis

Naphthalene

Alkanes have functional group :

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----X

--OH

----COH

No functional group

Ethylene decolorizes cold dilute solution of KMnO₄. This test is known as

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Colouration test

Baeyer's test

Silver mirror test

Ring test

Formula of chloroform is

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CH₃CI

CCI₄

CH₂CI₂

CHCI₃

Which of the following is not aromatic hydrogencarbon

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Benzene

Naphthalene

Toluene

Cyclohexene

The presence of a double bond in a compound in the sign of:

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Saturation

Unsaturation

Subsitution

None

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

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Hund's rule

Markownikov's rule

Pauli's Exclusion Principle

Auf bau Principle

the unreactivity of alkanes is based upon

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Inertness of sigma bond

Non-polarity of the bonds

Both A and B

None of above

The order of reactivity of halogens in aliphatic substitution reactions is

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Br2 > C12 > F2

C12 > Br2 > F2

C12 C12 > Br2

F2 > Br2 > C12

The temp. used for the hydrogenation of alkenes using Ni is

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2000°C

400°C

200-- 300°C

1000°C

An alkynes having Carbon count of 20 is

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gas

liquid

Solid

None

Amongst the following the compound that can be most readily sulphonated is

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Toluene

Benzene

Nitrobenzene

Chlorobenzene

Which of the following acid can be used as a catalyst in Friedal Craft's reactions

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AlCl₃

HNO₃

BeCl₂

NaCl

Mustard gas is a

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Gas

High boiling speed

High melting liquid

Steam

Which can be used for dehydration of alcohol

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P₄O₁₀

H₂SO₄

H₃PO₄

All of them

A fuel has the same knocking property as a mixture of 70 isooctane (2, 2, 4- trimethyl pentane) and 30% n-heptane by volume the octane number of the fuel is

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100

70

50

40

The benzene molecule contains

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Three double bonds

Two double bonds

One double bonds

Delocalizedπ-electron charge

Alkanes are gases :

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C₁-C₄

C₅-C₁₀

C₁₁-C₁₅

C₁₀-C₂₀

All are ortho & Para directing except

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X

OH

NR₃

NH₂

Ethylene combines with water in the presence of H₂SO₄+ HgSO₄and forms

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Ethyle chloride

Ethyle alcohol

Carboxylic acid

None of these

Kolb's method is not useful for the production of

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Methane

Ethane

Propane

Butane

The method in which alkanes prepared by alkyle halides in the presence of palladium - charcoal is

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Hydrolysis

Electrolysis

Hydrogenation

Hydrogenolysis

Meta directing group decreased the ----------- of benzene ring

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Physical activity

Chemical reactivity

Density

None

Vinyl acetylene combines with HCI to form

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Poly acetylene

Benzene

Chloroprene

Divinylacetylene

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