ECAT Pre Engineering Chemistry Chapter 19 MCQ Test With Answer

Synthesis of rubber is made by polymerization of

• Chloroform A
• Acetylene B
• Divinylacetylene C
• Butene 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

The molecule of ethane possess which hybrization

• sp³ A
• sp² B
• sp C
• sp²d D

The hydrocarbons having double bonds normally end with suffix

• Ane A
• Ene B
• Yne C
• Oic D

Free radical mechanism of halogenation of alkanes follow step:

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

In CH₄, all the H-C-H bond angles are

• 120° A
• 107° B
• 109° C
• 109.5° D

Hydrogenation of alkenes/alkynes inthe presence of Ni as catalyst at 3000°C result in the formation of corresponding alkanes. This reaction is known as

• Sabatier-senderens reaction A
• kolbes reaction B
• Cannizaro's reaction C
• Haloform reaction D

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

Octane number can be changed by

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

Zn + HCI are used in

• Clemenson reduction A
• Wof kishner reduction B
• Kolb's electrolysis C
• Wutruz reaction D

Kolb's method has limited synthetic applications due to

• Expensive catalysis A
• Slow reaction B
• Number of side products produced C
• Salts used are very expensive D

Which one does not declourized KMnO₄

• Alkenes A
• Alkynes B
• Bezene C
• All above D

When acetylene is passed through a copper tube at 300°C, it polymerizes to

• Polyacetylene A
• polyethylene B
• Benzene C
• None of these D

A six membered ring containing one double bond called

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

If we remove one hydrogen atom from an alkane we obtain a group called

• Acetyle group A
• Formyle group B
• Alkyle group C
• Ketyle group D

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

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

How many isomeric disubtituted products are obtained by the introducing of second group in the ring

• Two A
• Three B
• Four C
• None D

Which compound was recognized the parent member of aromatic compounds

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

Complete combustion of alkane yields

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

Raney - nickel is the alloy of Ni with

• Pt A
• Al B
• Cu C
• Pd D

The treatment of benzene with isobutene in the presence of sulphuric acid give

• isobutyl benzene A
• tert-Butyl benzene B
• n- Butyl benzene C
• no reaction D

Preparation of ethylbenzene by the reaction of bromobenzene, ethylbromide and sodium is called

• Wurtz reaction A
• Fitting reaction B
• Wurtz fitting reaction C
• None of these D

Which of the following is not an electrophitic substitution reaction of benzene

• Nitration A
• Sulphonation B
• Fridel-Craft alkylation C
• Free radical chlorination of benzene D

When sodium benzoate is treated with soda lime (NaOH) benzene is formed. What is the other product

• Na₂CO₃ A
• NaHCO₃ B
• Ca(OH)₂ C
• CaCO₃ D

Ethylene decolorizes cold dilute solution of KMnO₄. This test is known as

• Colouration test A
• Baeyer's test B
• Silver mirror test C
• Ring test D

Formula of chloroform is

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

Kolb's method of alkanes production, is actually

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

Benzene was discovered by Michael Faraday's in

• 1824 A
• 1825 B
• 1826 C
• 1827 D

Benzene is not prepared from

• Acetylene A
• Phenol B
• Benzoic acid C
• Bromo benzene D