ECAT Pre Engineering Chemistry Chapter 18 MCQ Test With Answer

When a carbon atom forms single bonds with other carbon atoms, these hybrid orbitals overlap with the orbitals of hydrogen to form four bonds which are

• Three sigma and one P_i A
• Two sigma and two P_i B
• One sigma and three P_i C
• sigma D

Geographical survey of Pakistan estimates about billion tons of coal in Pakistan:

• 182 A
• 183 B
• 184 C
• 185 D

In which molecule carbon atom is sp²hybridized

• CH₄ A
• C₂H₄ B
• C₂H₂ C
• None of the above D

Angle 120° is observed in molecules :

• CH₄ A
• CH_3-CH₃ B
• CH -CH C
• CH_{2 =}CH₂ D

A double bond consists of:

• Two sigma bonds A
• One sigma and one pi bonds B
• One sigma and two pi bonds C
• Two pi bonds D

Diversity of organic compounds in millions is:

• Four A
• Five B
• Six C
• Seven D

Which of the following pair contains isomers of each other

• Propanoic acid and propanone A
• Acetone and acetaldehyde B
• Ethyl alcohol and diethyl ether C
• Methyl alcohol and dimethyl ether D

The functional group of acid amide is

• 
  A
• 
  B
• 
  C
• 
  D

Organic compounds are soluble in all except

• Benzene A
• Petroleum B
• Ether C
• Water D

The active part in a molecule is called

• Homologous series A
• Functional group B
• Chemical bonding C
• Ionic complex D

Which of these always applies to a nucleophile

• It attacks a double bond A
• It has a lone pair of electrons B
• It is single atom C
• It is negatively charged D

Linear geometry is present in:

• Sp³ A
• Sp² B
• Sp C
• D²sp³ D

Wholer prepared urea from

• Ammonia A
• NH₄CNO B
• NH₃ C
• Uric acid D

• 1 A
• 2 B
• 3 C
• 4 D

Which is not a fossil fuel

• Petroleum A
• Coal B
• Natural gas C
• None of them D

n-butane and iso butane are an example of

• Chain isomerism A
• Positional isomerism B
• Meta merism C
• Functional group isomerism D

The open chain organic compounds are called

• Linear compounds A
• Aromatic B
• Aliphatic C
• Both A and B D

Hybridzation explain the --------- of orbitals

• Type of bonding A
• Shapes B
• Shape and type of bonding C
• None of above D

Which is the chain isomer of n-pentane

• Isopentane A
• Neopentene B
• N-pentene C
• Isopentene D

The gasoline with high octane No. has ______

• More knocking A
• Less knocking B
• No knocking C
• Only knocking D

The branch of chemistry which deals with the study of compounds containing carbon as an essential elements is called

• Physical A
• Inorganic B
• Nuclear C
• Organic D

Wohler synthesized first of all the organic compound:

• Carbohydrates A
• Urea B
• Aniline C
• Toluene D

The formula of esters is

• 
  A
• 
  B
• 
  C
• 
  D

Cracking done at low pressure and with a catalyst is called _______ cracking

• Thermal A
• Catalytic B
• Steam C
• None of them D

In alkynes the bonds between carbon atoms are

• All sigma bonds A
• All pi(π) bonds B
• One is sigma and two areπ(pi) bonds C
• One isπ(pi) and two are sigma bonds D

The quality of petroleum is determined by

• Decane number A
• Octane number B
• Nexane number C
• None of these D

A double bond consists of

• Two sigma bonds A
• One sigma and one Pi bond B
• One sigma and two Pi bonds C
• Two Pi bonds D

Which of the following is an aromatic compound

• Propanol A
• Cyclohexane B
• Acetone C
• Benezene D

Homologues differ from each other by an integral number of

• CH₂groups A
• CH₃groups B
• CH groups C
• CH₄groups D

In the presence of high temperature and pressure peat is converted to:

• Lignite A
• Polymorphism B
• Polymerization C
• Catenation D