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

Which of the following method is most appropriate for the manufacture of methane?

• By reduction of CH2CL2 A
• Wurtz reaction B
• Liquification of natural gas C
• None of these D

Mustard gas is a :

• Gas A
• Liquid B
• Solid C
• High boiling point D

Zn + HCI are used in

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

Benzene is obtained from benzene sulphonic acid by treating with

• HCl A
• NaOH B
• H₂O C
• NaHCO₃ D

When benzene is burnt in free supply of air, it is completely oxidized to

• CO A
• CO₂₊H₂O B
• H₂CO₃ C
• None D

The order of reactivity of halogens in aliphatic substitution reactions is

• Br2 > C12 > F2 A
• C12 > Br2 > F2 B
• C12 C12 > Br2 C
• F2 > Br2 > C12 D

Formula of chloroform is:

• CH₃Cl A
• CCl₄ B
• CH₂Cl₂ C
• CHCl₃ D

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

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

Alkanes have functional group :

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

Which is liquid among the following alkenes?

• Ethane A
• Propene B
• Butene C
• Pentene D

Alkanes are soluble in all except

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

Complete combustion of alkane yields

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

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

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

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

Th IUPAC name of the compound having formula (CH3) 3 C - CH = CH2 is

• 1, 1-Dimethyl-3-butene A
• 1,1,1-Trimethyl-3-propene B
• 3,3,-Dimenthyl-1-butene C
• 3,3,3,-Trimethyl-1-propene D

In CH₄, all the H-C-H bond angles are

• 120° A
• 107° B
• 109° C
• 109.5° D

Alkynes are colourless & odouless except

• Acetylene A
• Propyne B
• Butyne C
• Pentyne D

Sp³hybird orbitals are oriented at an angle of

• 107.5° A
• 108.5° B
• 109.5° C
• 103.5° D

Alkanes containing carbon C₁₈ownwards are

• Gases A
• Liquids B
• Waxy solids C
• Solids D

Benzene was discovered by Michael Faraday's in

• 1824 A
• 1825 B
• 1826 C
• 1827 D

CnH_2nis the general formula of

• Alkanes A
• Alkanes B
• alkynes C
• None of above D

Preparation of vegetable ghee involves:

• Halogenation A
• Hydrogenation B
• Hydroxylation C
• Dehydrogenation D

The next homologue of C₁₀H₂₂will be

• C₉H₂₀ A
• C₁₂H₂₆ B
• C₁₁H₂₄ C
• C₁₃H₂₈ 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 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

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

Reaction of ethanes with KMnO₄ gives:

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