ECAT Pre Engineering Chemistry Chapter 19 MCQ Test With Answer

Ethylene polymerizes at 100 atm pressure and 400°C to give

• Polybenzene A
• Polyalcohol B
• Polypropylene C
• Polyethylene D

Formula of chloroform is

• CH₃CI A
• CCI₄ B
• CH₂CI₂ C
• CHCI₃ D

Synthesis of rubber is made by polymerization of

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

CnH_2nis the general formula of

• Alkanes A
• Alkanes B
• alkynes C
• None of above D

Complete combustion of alkane yields

• CO₂+ H₂O A
• CO₂+ heat B
• CO + H₂O heat C
• CO₂+ H₂O + heat D

Which gas is used for welding purposes

• Butane A
• Nitrogen B
• Methane C
• Acetylene D

The electrophile in aromatic sulphonation is

• H₂SO₄ A
• HSO₄ B
• SO₃ C
• SO₃⁺ D

The compound prepared by a substitution reaction of benzene is

• Acetophenone A
• Glyoxal B
• Cyclohexame C
• Hexabromo cyclohexane D

During the preparation of alkanes the hydrogenation of alkenes or alkynes the catalyst may be

• H₂SO₄ A
• Ni B
• Fe₂O₃ C
• Al₂O₃ 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

When n-hexane is heated in the presence of Pt at 500°C, it cyclists to give

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

Which gas is produced by treating CaC₂with water

• Methane A
• Ethane B
• Acetylene C
• HCI D

Toluene is also called

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

Benzene does not undergo polymerization and it is also resistant to

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

Polymerization of ethane take place at pressure of 100 atm and a temperature of

• 200°C A
• 400°C B
• 600°C C
• 800°C D

The method used only for the production of symmetrical alkanes

• Kolb's method A
• Clemmenen B
• Cannizzaro C
• Wolf kishner D

The benzene molecule contains

• Three double bonds A
• Two double bonds B
• One double bonds C
• Delocalizedπ-electron charge D

The sp²hybird orbitals are oriented in space at one angle

• 180° A
• 109.5° B
• 100° C
• 120° D

The electron releasing effect of methyl group is significant and it makes ring a good

• Electrophilic A
• Nucleophilic B
• Nucleophobic C
• Hydrophobic D

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

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

Hydrocarbons are divided into aliphatic, alicyclic and aromatic which structure among the following show an alicyclic hydrocarbon

• 
  A
• 
  B
• 
  C
• 
  D

Octane number can be changed by

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

Free radical mechanism of halogenation of alkanes follow step:

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

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

• Physical activity A
• Chemical reactivity B
• Density 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

A six membered ring containing one double bond called

• Cyclohexene A
• Cyclohexane B
• Cyclohexadiene C
• None D

Marsh gas was the name given to

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

The nitration of benzene takes place when it is heated with a mixture of conc.HNO₃and conc. H₂SO₄at 50°C in ratio of

• 1 : 2 A
• 1 : 1 B
• 1 : 3 C
• 2 : 1 D

The alkynides are used for the ----------- of alkynes

• Pxperation A
• Purification B
• Seperation C
• All of above D