ECAT Pre Engineering Chemistry Chapter 19 MCQ Test With Answer

Most common reactions of benzene and its derivatives are

• electrophilic addition reactions A
• electrophilic substitution reactions B
• Nucleophilic addition reactions C
• Nucleophilic subtitution reactions D

Aromatic hydrocarbons are the derivatives of

• Normal series of paraffins A
• Alkene B
• Benzene C
• Cyclohexane D

• 2-bromonitrobenzene A
• 2-nitrobromobenzene B
• 1-bromonitrobenzene C
• 1-nitrobromobenzene D

Hydrocarbon which is liquid at room temperature is

• Pentane A
• Butane B
• Propane C
• Ethane D

Which class of compound is more reactive

• Alkane A
• Alkene B
• Alkyne C
• None D

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

• Hund's rule A
• Markownikov's rule B
• Pauli's Exclusion Principle C
• Auf bau Principle D

Which one of the following is (m-xylene)

• 1,2 dimethyl benzene A
• 1,3 dimethyl benzene B
• 1,5 dimethyl benzene C
• 1,4 dimethyl benzene D

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

• 2000°C A
• 400°C B
• 200-- 300°C C
• 1000°C D

Hybridization in alkanes is:

• sp A
• sp² B
• sp³ C
• dsp² D

Which one of the following gases is used for artificial ripening of fruits

• Ethene A
• Ethane B
• Methane C
• Propane D

The order of reactivity of halogen acids towards alkenes

• HCl > HBr > Hl A
• HBr > HCl > HI B
• HCl > HBr C
• HI > HBr > HCl D

Benzene does not undergo polymerization and it is also resistant to

• Reduction A
• Oxidation B
• Alkylation C
• Ozonolysis D

The reaction in which ketone is reduced to the alkane is called

• Kolb A
• Clemmensen B
• Cannizzaro C
• None D

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

• 100 A
• 70 B
• 50 C
• 40 D

Which one of following is not monocyclic aromatic hydrocarbon

• Benzaldehyde A
• Benzoic acid B
• Benzene sulfonic acid C
• Biphenyl D

Which of the following method is most appropriate for the manufacture of methane?

• By reduction of CH2CL2 A
• Wurtz reaction B
• Liquification of natural gas C
• None of these D

Substitution of halogen in the benzene ring requires catalyst

• AlCl₃ A
• FeCl₃ B
• SiO₂ C
• Organo - nickel D

Raney - nickel is the alloy of Ni with

• Pt A
• Al B
• Cu C
• Pd D

Benzene reacts with ozone and gives

• Glycerin A
• Glyoxal B
• Maleic anhydride C
• Benzoic acid D

Sp³hybird orbitals are oriented at an angle of

• 107.5° A
• 108.5° B
• 109.5° C
• 103.5° D

All are ortho & Para directing except

• X A
• OH B
• NR₃ C
• NH₂ D

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

• Chloroform only A
• Carbon tetrachloride only B
• Chloromethane and dichloromethane C
• Mixture of a, b, c D

Synthetic rubber is made by polymerization of

• Chloroform A
• Acetylene B
• Divinlacetylene C
• Butene D

The hydrocarbon which is used as an illuminating agent

• Methane A
• Methene B
• Methyne C
• B & C D

When alkyl is treated with chlorine in the presence of sunlight

• 1,3 dichloroproduct is formed A
• 1,4 dichloro product is formed B
• 1,3,5 trichloro product is formed C
• Only alkyl group is substituted D

Which one of the following gases is used for artificial ripening of fruits ?

• Ethane A
• Ethyne B
• Methane C
• Propane D

Hybridization of each carbon atom in benzene ring is

• sp hybridized A
• sp²hybridized B
• sp³ C
• dsp² D

During nitration of benzene, the active nitrating agent is

• NO3 A
• NO2+ B
• NO2- C
• HNO3 D

Alkene general formula :

• C_nH_2n+2 A
• C_nH_2n B
• C_nH_2n-2 C
• C_nH_2n+1 D

Which of the following is not aromatic hydrogencarbon

• Benzene A
• Naphthalene B
• Toluene C
• Cyclohexene D