ECAT Pre Engineering Chemistry Chapter 19 MCQ Test With Answer

The order of dehydration of alcohol

• 10> 20> 30 A
• 10> 30> 20 B
• 20> 30> 10 C
• 30> 20> 10 D

The stability of acromatic compounds decreases with ------- in the no. of its resonance structure

• Decrease A
• Increase B
• Remain constant C
• Partially decreases D

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

• 
  A
• 
  B
• 
  C
• 
  D

• 4-methyl pentene A
• 2-methyle-1-butene B
• 2-methyl propane C
• None of the above D

Alkanes are least reactive towards:

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

Eletronegativity difference in C-C bond in alkanes is:

• Zero A
• Double B
• Half C
• 4.0 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

Alkenes combine readily with electrophillic reagents such as halogens giving

• Haloalkanes A
• Gem-dihalides B
• Vicinal dihalides C
• Vinyl halides D

Free radical mechanism of halogenation of alkanes follow step:

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

Kolb's method is not useful for the production of

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

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

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

A salt producing hydrocarbon among these compounds is

• Ehyne A
• Ethene B
• Methane C
• Ethane D

The addition of unsymmetrical reagent to an unsymmetrical alkene is in accordance with the rule

• Hund's rule A
• Markowvikov's rule B
• Pauli's exclusion principle C
• Auf ban principle D

Alkanes have functional group :

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

Octane number can be changed by

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

Benzene does not undergo polymerization and it is also resistant to

• Reduction A
• Oxidation B
• Alkylation C
• Ozonolysis 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

The molecule of ethane possess which hybrization

• sp³ A
• sp² B
• sp C
• sp²d D

During the preparation of alkynes the active metals that react with tetra halo-alkanes are

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

Physical properties of alkanes increase with increase of all physical constants except

• Boiling points A
• Melting points B
• Density C
• Solubility D

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

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

Which compound was recognized the parent member of aromatic compounds

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

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

• 
  A
• 
  B
• 
  C
• 
  D

Vinyl acetylene combines with HCI to form

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

Write the name of following compound

• 5 - methyle - 2- hexene A
• 2 - methyle hexene B
• 4 - ethyle - 2 - methyle hexene C
• 3 - ethyle - 3 - methyl hexene D

Replacement of hydrogen by NO₂group is called

• Sulphonatioin A
• Hydration B
• Nitration C
• Cracking D

B-B'-dichloroethyl sulphide is commonly known as

• Mustard gas A
• Laughing gas B
• Phosgene gas C
• Bio gas D

The addition of HBr is easiest with

• CH2 = CHCl A
• CICH = CHCl B
• CH3 - CH = CH2 C
• (CH3)2 C = CH2 D

Alkanes are gases :

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

The method used only for the production of symmetrical alkanes

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