ECAT Pre Engineering Chemistry Chapter 19 MCQ Test With Answer

Hydrocarbons contain :

• Carbon only carbon A
• Hydrogen only B
• Carbon & hydrogen C
• Carbon , hydrogen & halogen D

Alkyl halides when reduced with nascent hydrogen in the presence of Zn + HCI, are converted to

• Alkynes A
• Alkenes B
• Alkanes C
• Alcohol D

Alkanes are soluble in all except

• Benzene A
• Ether B
• Water C
• Carbon tetra chloride D

Which reaction sequence would be best to prepare 3-chloro-aniline from benzene?

• Chlorination, nitration, reducing A
• Nitration, chlorination, reducition B
• Nitration, reduction,chlorination C
• Nitration, reduction, acylation, chlorination, hydrolysis D

The term aromatic was derives from

• Greek word A
• Latin B
• Russian C
• English D

Alkanes have functional group :

• ----X A
• --OH B
• ----COH C
• No functional group D

The simplest and the parent members of aromatic hydrocarbon is

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

To differentiate isomers we use

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

Kolb's method is not useful for the production of

• Methane A
• Ethane B
• Propane C
• Butane 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

Hybridization of each carbon atom in benzene ring is

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

Which gas is used for welding purposes

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

The method used only for the production of symmetrical alkanes

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

Acetylene gives

• White ppt. with ammonical AgNO3 and red ppt. with ammonical Cu(NO3)2 A
• White ppt. with ammonical AgNO3 and red ppt. with ammonical Cu2C12 B
• White ppt. with both C
• Red ppt. with both D

The next homologue of C₁₀H₂₂will be

• C₉H₂₀ A
• C₁₂H₂₆ B
• C₁₁H₂₄ C
• C₁₃H₂₈ D

The method involved for electrolysis of Na or K salts of carboxylic acids

• Sabatier's sendrens reaction A
• Kolbe's method B
• Clemmensen C
• Wolf kishner reduction D

De halogenatiion of tetrahalides happens in the presence of active metal like

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

Substitution of halogen in the benzene ring requires catalyst

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

Acetylene is used in the manufacture of

• Rubber A
• Plastic B
• Ethyle alcohol C
• All of these D

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

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

Sulphuric acid generates nitronium ion by reacting with

• Nitric acid A
• Nitrogen gas B
• Nitrous acid C
• Potassium nitrate D

Incomplete oxidation of alkanes yields

• CO₂& carbon black A
• CO₂+ heat B
• CO and carbon black C
• CO + heat D

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

Which of the following is an ortho-para directing group

• 
  A
• 
  B
• 
  C
• 
  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

Vinyl acetylene combines with HCI to form

• Poly acetylene A
• Benzene B
• Chloroprene C
• Divinylacetylene D

Vinyl acetylene combines with HCl to form:

• Polyacetylene A
• Benzene B
• Chloroprene C
• Divinyl acetylene D

Which one does not declourized KMnO₄

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