ECAT Pre Engineering Chemistry Chapter 19 MCQ Test With Answer

Octane number can be changed by

• Isomerisation A
• Alkylation B
• Cyclisation C
• All of these D

Catalytic oxidation of alkanes is used for the preparation of

• Adehydes A
• Ketones B
• Fatty acid C
• Carbonyylic acids D

During the preparation of alkynes the active metals that react with tetra halo-alkanes are

• Zn A
• Mg B
• Both a and b C
• None D

Which compound was recognized the parent member of aromatic compounds

• Aniline A
• Phenol B
• Benzene C
• Toluene D

Eletronegativity difference in C-C bond in alkanes is:

• Zero A
• Double B
• Half C
• 4.0 D

The hydrocarbon which is used as an illuminating agent

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

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

• Hydrolysis A
• Electrolysis B
• Hydrogenation C
• Hydrogenolysis D

Which is the used as test for the presence of alkenes

• Reaction of cold dilute alkaline KMnO₄ A
• Combustion B
• Polymerization C
• Catalytic hydrogenation D

Hydrocarbon which is liquid at room temperature is

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

• Pent -1-ene-3-yne A
• 2-pentyne-4-ene B
• 1-pentene-3-yne C
• Pent-2-yen-4-ene D

Which reaction is too vigorous to control

• Chlorination A
• Bromination B
• Iodination C
• Fluorination D

The geometry of acetylene is

• Angular A
• Bent B
• Trigonal C
• Linear D

The addition of unsymmetrical reagent to an unsymmetrical alkene is in accordance with

• Hund's rule A
• Markownikov's rule B
• Pauli's Exclusion principle C
• Auf ban principle D

Nitroalkane are used in

• Fuel A
• Solvents B
• Organic synthesis C
• All of them 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

Free radical mechanism of halogenation of alkanes follow step:

• Initiation A
• Propagation B
• Termination C
• All of these D

To differentiate isomers we use

• n- A
• iso- B
• neo C
• All of them D

When benzene is burnt in free supply of air, it is completely oxidized to

• CO A
• CO₂₊H₂O B
• H₂CO₃ C
• None D

Toluene is also called

• Hydroxyl benzene A
• Methyl benzene B
• ethyl benzene C
• None D

• 2, 3-dimethylbutane A
• 2, 3-methylbutane B
• 2-dimethylbutane C
• Dimethylbutane D

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

• Physical activity A
• Chemical reactivity B
• Density C
• None D

Benzene is obtained by fractional distillation of

• Heavy oil A
• Anthracene oil B
• Middle oil C
• Light oil D

Substitution of halogen in the benzene ring requires catalyst

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

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

• C6H6 + NH3 A
• C6H6 + NH4 B
• C6H6 + CH3Cl C
• C6H6 + CH3COCl D

Alkanes are generally not reactive towards acids, alkalis, oxidation or reuducing agents. They however undergo some reactions, which one is the reaction undergone by alkanes

• Elemination A
• Addition B
• Free radical substitution C
• Nucleophilic substation D

Benzene is obtained from benzene sulphonic acid by treating with

• HCl A
• NaOH B
• H₂O C
• NaHCO₃ D

Alkenes combine readily with electrophillic reagents such as halogens giving

• Haloalkanes A
• Gem-dihalides B
• Vicinal dihalides C
• Vinyl halides D

Which is liquid among the following alkenes?

• Ethane A
• Propene B
• Butene C
• Pentene D

Which of the following possesses the highest melting point?

• Chlorobenzene A
• 0-Dichlorobenzene B
• m-Dichlorobenzene C
• p-Dichlorobenzene D

Formula of chloroform is:

• CH₃Cl A
• CCl₄ B
• CH₂Cl₂ C
• CHCl₃ D