ECAT Pre Engineering Chemistry Chapter 19 MCQ Test With Answer

Synthetic rubber is made by polymerization of

• Chloroform A
• Acetylene B
• Divinlacetylene C
• Butene 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

Benzene does not undergo polymerization and it is also resistant to

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

Which of the following acid can be used as a catalyst in Friedal Craft's reactions

• AlCl₃ A
• HNO₃ B
• BeCl₂ C
• NaCl D

Boiling point of n-butane is:

• -102°C A
• -75°C B
• -55°C C
• 55°C D

The reaction-method that does not give an alkane is

• Catalytic hydrogenation of alkanes A
• Wurtz reaction B
• Hydrolysis of alkyl magnesium bromide C
• Dehydrohalogenation of an alkyl halide D

The difference between amount of heat actually released and that of calculated is called

• Bonding energy A
• Activation energy B
• Resonance energy C
• Transition energy D

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

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

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

• Ethene A
• Ethane B
• Methane C
• Propane 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

Free radical mechanism of halogenation of alkanes follow step:

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

When an aqueous solution of potassium salt of monocarboxylic acid is subjected to electrolysis, corresponding alkane is formed. This reation is known as

• Cannizaro reaction A
• Sabatier-secderens reaction B
• Alkylation C
• Kolbe's reaction D

The general formula of alkane is

• C_nH_2n+2 A
• C_nH_n B
• C_nH_2n C
• C₂H_2n-1 D

Alkanes are gases :

• C₁-C₄ A
• C₅-C₁₀ B
• C₁₁-C₁₅ C
• C₁₀-C₂₀ D

Benzene is prepared from n-hexane in the presence of catalyst

• Cr₂O₃ A
• Al₂O₃ B
• SiO₂ C
• All above D

An alkynes having Carbon count of 20 is

• gas A
• liquid B
• Solid C
• None D

The electrophile in aromatic sulphonation is

• H₂SO₄ A
• HSO₄ B
• SO₃ C
• SO₃⁺ D

Which of the following is not an ortho-para directing group

• 
  A
• 
  B
• 
  C
• 
  D

The process in which orbitals of different energies and shapes mix with each other to give equivalent hybrid orbitals is called

• Isomerization A
• polymerization B
• Hybridization C
• Resonance D

Reaction of ethanes with KMnO₄ gives:

• Ozonide A
• Glyoxal B
• Glycol C
• Oxalic acid D

Benzene was discovered by Michael Faraday's in

• 1824 A
• 1825 B
• 1826 C
• 1827 D

Alkanes are least reactive towards:

• Acids and bases A
• Reducing agents B
• Oxidizing agents C
• All of these D

The C-C bond angles in benzene ring are

• 119° A
• 120° B
• 121° C
• None D

Kolb's method of alkanes production, is actually

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

Benzene does not undergo

• Substitution reaction A
• Addition reaction B
• Oxidation reaction C
• Elimination reaction D

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

A salt producing hydrocarbon among these compounds is

• Ehyne A
• Ethene B
• Methane C
• Ethane 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

C₁₈and onward hydrocarbons are normally

• Gases A
• Liquids B
• Solids C
• Plasma D

The compound prepared by a substitution reaction of benzene is

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