ECAT Pre Engineering Chemistry Chapter 19 MCQ Test With Answer

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

• 
  A
• 
  B
• 
  C
• 
  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

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

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

Which gas is produced by treating CaC₂with water

• Methane A
• Ethane B
• Acetylene C
• HCI 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

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

The temp. used for the hydrogenation of alkenes using Ni is

• 2000°C A
• 400°C B
• 200-- 300°C C
• 1000°C D

The next homologue of C₁₀H₂₂will be

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

The hydrocarbon used for polymerization is

• Alkanes A
• Alkenes B
• Alkynes C
• All of above D

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

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

Odour of alkene is:

• Fruity A
• Odourless B
• Zarlic like C
• Irritating D

Complete combustion of alkane yields

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

Synthetic rubber is made by polymerization of

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

All C - H bond lengths of benzene ring is

• 1.07A° A
• 1.09A° B
• 1.08A° C
• None D

All are ortho & Para directing except

• X A
• OH B
• NR₃ C
• NH₂ D

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

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

During nitration of benzene, the active nitrating agent is

• NO3 A
• NO2+ B
• NO2- C
• HNO3 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

Alkyl benzenes are readily oxidized by axidfied

• KMnO₄ A
• K₂CO₃ B
• MnO₄ C
• H₂SO₄ D

In CH₄, all the H-C-H bond angles are

• 120° A
• 107° B
• 109° C
• 109.5° D

Hydrocarbons contain :

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

Reaction of ethanes with KMnO₄ gives:

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

The geometry of acetylene is

• Angular A
• Bent B
• Trigonal C
• Linear 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

Amongst the following the compound that can be most readily sulphonated is

• Toluene A
• Benzene B
• Nitrobenzene C
• Chlorobenzene D

Kolb's method of alkanes production, is actually

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

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