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O.P Tandon Test: Hydrocarbons - NEET MCQ


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O.P Tandon Test: Hydrocarbons - Question 1

in the Wurtz reaction method of preparation of alkanes, the stoichiometric coefficient of Sodium is

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2 Na atoms are used.

O.P Tandon Test: Hydrocarbons - Question 2

When two hydrogen atoms in benzene are replaced by two similar or different monovalent atoms or groups, how many different position isomers are possible?

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Ortho , meta and para.

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O.P Tandon Test: Hydrocarbons - Question 3

Which of the following reactions of methane is incomplete combustion?

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 is incomplete combustion.

O.P Tandon Test: Hydrocarbons - Question 4

The hydrocarbon which can react with sodium in liquid ammonia is

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It is a terminal alkyne, having acidic hydrogen.

O.P Tandon Test: Hydrocarbons - Question 5

n-Propylbromide on treatment with ethanolic KOH is

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Elimination reaction takes place.

O.P Tandon Test: Hydrocarbons - Question 6

The number of possible conformational isomers of ethane is

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Infinite conformational isomers of ethane is possible since continuous rotations around C-C bond is there.

O.P Tandon Test: Hydrocarbons - Question 7

The unusual behavior of benzene is explained by

Detailed Solution for O.P Tandon Test: Hydrocarbons - Question 7

Continuous delocalization of pi electron or resonace in benzene

O.P Tandon Test: Hydrocarbons - Question 8

Among the following compounds the one that is most reactive towards electrophilic nitration is

Detailed Solution for O.P Tandon Test: Hydrocarbons - Question 8

Methyl group is electron donating group, hence increase electron density in benzene ring.

O.P Tandon Test: Hydrocarbons - Question 9

The treatment of CH3MgX with CH3C ≡ C−H produces

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Methane is produced by reaction with grignard reagent.

O.P Tandon Test: Hydrocarbons - Question 10

Acetylene is prepared by the action of water on

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Ethyne gas(Acetylene) is prepared in the laboratory by the action of water on calcium carbide.

CaC2 +  2H2O  ----------> C2H2 + Ca(OH)2   

O.P Tandon Test: Hydrocarbons - Question 11

boiling point of alkanes

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As molecular mass increase boiling point increases.

O.P Tandon Test: Hydrocarbons - Question 12

Aromatics are charachterized by the presence of _____ π electrons in the ring where n is an integer (n = 0, 1, 2, . . .).

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Huckel rule.

O.P Tandon Test: Hydrocarbons - Question 13

Which branched chain isomer of the hydrocarbon with molecular mass 72u gives only one isomer of mono substituted alkyl halide?

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Neopentane with Cl2​ and monohalogenation gives single product.

O.P Tandon Test: Hydrocarbons - Question 14

Benzene reacts with chlorine in sunlight to give a final product

Detailed Solution for O.P Tandon Test: Hydrocarbons - Question 14

 In this reaction we are not using AlCl3​ we are using direct Cl2​ gas in presence of strong radiation-Ultraviolet which is then able to break open the double bonds of the benzene ring and facilitate the approach of the reactive intermediate of chlorine, most probably a free radical of Clsince it is believed if the reaction proceeds by free radical mechanism this way all the carbons of benzene will have equal share of electron (moreover in the space freons disturbs ozone layer because they are able to form free radicals with UV rays). So it is believed it proceeds via free radical mechanism and hence form gammaexane(gamma isomer) with other minor isomers of C6​Cl6​H6​.

O.P Tandon Test: Hydrocarbons - Question 15

What is the product obtained on electrolyzing potassium fumarate?

Detailed Solution for O.P Tandon Test: Hydrocarbons - Question 15

Ethyne (C2H2) and CO2.accompanied with the formation of KOH and H2.

Hence B is correct.

O.P Tandon Test: Hydrocarbons - Question 16

Halogenation of alkanes is a

Detailed Solution for O.P Tandon Test: Hydrocarbons - Question 16

Alkane halogenation is an example of a substitution reaction, a type of reaction that often occurs in organic chemistry. A substitution reaction is a chemical reaction in which part of a small reacting molecule replaces an atom or a group of atoms on a hydrocarbon or hydrocarbon derivative.

O.P Tandon Test: Hydrocarbons - Question 17

What is the commercially used method to produce benzene?

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All of the mentioned methods can be used but the commercially used method is from the isolation from coal tar.

O.P Tandon Test: Hydrocarbons - Question 18

Ethyl benzene CANNOT be prepared by ______

Detailed Solution for O.P Tandon Test: Hydrocarbons - Question 18

Wurtz reaction is used to make symmetrical hydrocarbons thus it cannot be used to make ethyl benzene.

O.P Tandon Test: Hydrocarbons - Question 19

The general formula of a cycloalkane is

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Cycloalkanes have general formula of CnH2n

O.P Tandon Test: Hydrocarbons - Question 20

What product is obtained by heating ethylidene chloride with alcoholic KOH?

Detailed Solution for O.P Tandon Test: Hydrocarbons - Question 20

Dehydrohalogenation takes place. Preparation of alkyne by heating ethylene chloride with alc. KOH followed by sodamide in ammonia solution.

O.P Tandon Test: Hydrocarbons - Question 21

Carbon-carbon double bond in alkenes consists of

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sigma bond is formed by head-on overlap, pi bond is formed by lateral overlap. Alkenes contain 1 pi bond and 1 sigma bond.

O.P Tandon Test: Hydrocarbons - Question 22

in Friedel-Crafts alkylation reaction, when benzene is treated with an alkyl halide in the presence of a catalyst, alkylbenene is formed. The catalyst used is

Detailed Solution for O.P Tandon Test: Hydrocarbons - Question 22

anhydrous alluminium chloride produces electrophile to attack benzene.

O.P Tandon Test: Hydrocarbons - Question 23

Ozonolysis of an organic compound 'A' produces acetone and propionaldehyde in equimolar mixture. Identify 'A' from the following compounds 

[AIEEE 2011]

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O.P Tandon Test: Hydrocarbons - Question 24

Cyclohexene on ozonolysis followed by reaction with zinc dust and water gives compound E.Compound E on further treatment with aqueous KOH yields compound F.Compound F is

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O.P Tandon Test: Hydrocarbons - Question 25

What product is obtained by passing ethanol vapours over heated alumina?

Detailed Solution for O.P Tandon Test: Hydrocarbons - Question 25

Dehydration of alcohols is done in presence of alumina at 3500−4000 and by this process alkene is obtained.

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