Question # 1

Acetylide can give back ethyne upon treatment with

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water

strong base

dil. Acid

weak base

Which of the following tests helps to distinguish between alkyne and alkene?

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Lucas test

Tollen's reagent test

Baeyer's test

Fehling's solution test

Glyoxal molecule has?

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two carbonyl groups

One aldehydic and one carbonyl group

Two aldehydic groups

Two carboxyl group

2-Propenol, on rearrangement, yields

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Propanal

Propanone

2-propano

Both A and B

Which of the following is not an electrophilic substitutional reaction of benzene?

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Free radical chlorination of benzene

Friedel Craft alkylation

Sulphonation

Nitration

A compound that has a nucleophilic carbon?

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C2H2

C2H4

C3H8

C6H6

Substituted phenyl group are called

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Arene groups

Alkyl groups

Aryl groups

Acyl groups

The reaction that generates an ionic bond is

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Halogenation of ethene

polymerization of ethene

Hydrogenation of ethyne

Reaction of ethyne withs sodamide

The origin ofacidic nature of alkyne is?

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small size of C

Small size of H

polarity of triple bond

sp hybridization

Benzene cannot undergo the ------- directly

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Substitution reaction

Addition reaction

Oxidation reaction

Elimination reaction

Among the following the polycyclic aromatic compound is

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Styrene

Naphthalene

Toluene

Acetophenone

The pi-electrons in the styrene are

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13

10

8

6

Ethane when completely halogenated in excess of chiorine can form

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Hexachloroethane

Dichloroethane

Pentachloroethane

1.1.2.2-terachloroethane

Active sulphonating agent during sulphonation of benzene is

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SO2

SO3

SO3H

SO3+

C-H bond length in the benzene is

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0.99A°

1.09A°

1.12A°

1.34A°

Dehydrohalogenation of alkyl halides happens in the presence of

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Pd

Ni

Zn

KOH/alcohol

Which one of the following is a powerful electrophile used to attack on the electrons of benzene ring?

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FeCl2

Cl+

FeCl-4

Cl2

Aniline is the derivative of the benzene containing the

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Hydroxyl group

Amino group

Amido group

Imido group

The heat of hydrogenation of most of the alkene is about

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120 kJ/mol

100 kJ/mol

140 kJ/mol

105 kJ/mol

The angle between the unhybridized 2pz orbital and the three sp2 hybrid orbitals in ethene is

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180°

120°

90°

60°

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