ECAT Pre Engineering Chemistry Chapter 18 MCQ Test With Answer

The atom other than C in a hetrocyclic compound is called as

• Hetroatom A
• Hetroion B
• Hetromolecule C
• Hetroelement D

The gasoline with high octane No. has ______

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

Homologues differ from each other by an integral number of

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

• 0 A
• 1 B
• 2 C
• 3 D

The major components of coal gas are

• Hydrogen and methane A
• Ethane and carbon monoxide B
• Nitrogen and ethane C
• Ethane and carbon dioxide D

Self linkage of carbon to produce long chains

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

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

Wohler succeeded in obtaining, urea from

• Cyanogen A
• Ammonium cyanate B
• Ammonium hydroxide C
• None of these D

The chemist who synthesized urea form ammonia cyanate was:

• Berzelius A
• Kolbe B
• Wohler C
• Lavoiser D

Cracking products are :

• Only alkanes A
• Only alkenes B
• Alkanes and alkenes C
• Alkynes D

Which of the following contains single bonds

• Benzene A
• Alkyne B
• Alkene C
• Alkane D

The percentage of methane in natural gas is

• 50% A
• 60% B
• 85% C
• 90% D

Which of the following is a product of destructive distillation of coal

• Ammonia A
• Coke B
• Cyanides C
• Kerosene D

1-butene an 2-butene are an example of

• Chian isomerism A
• Positional isomerism B
• Metamerism C
• Functional group isomerism 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 set of hybrid orbitals has planar triangular shape

• sp³ A
• sp B
• sp² C
• dsp² D

Select from the following the one which alcohol

• 
  A
• 
  B
• 
  C
• 
  D

In ter-butyl alcohol, the tertiary carbon is bonded to

• Two hydrogen atoms A
• Three hydrogen atoms B
• One hydrogen atoms C
• No hydrogen atom 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

Peat contains about

• 60% carbon A
• 80% carbon B
• 78% carbon C
• 50% carbon D

The rotation of two carbon atoms joined by double bond would happened only if

• Pi bond is broken A
• Sigma bond is broken B
• Both bonds are broken C
• None of above D

The fractions obtained from fractional distillation of petroleum are placed in increasing order of their boiling points. Which order is correct

• Natural gas, petroleum ether, gasoline kerosene A
• Petroleum ether, kerosene, natural gas, petroleum ether B
• Gasoline, kerosene, natural gas, petroleum ether C
• Kerosene, gasoline, petroleum ether, natural gas 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 open chain compounds are also called

• Aliphatic A
• Alicylic B
• Aromatic C
• Both a and b D

Products of coal is:

• Peat A
• Lignite B
• Bituminous coal C
• All above D

Select from the following which one is alcohol?

• CH₃-CH₂-OH A
• CH₃-O-CH₃ B
• CH₃COOH C
• CH₂-CH₂-BR D

How many structural acid cis-trans isomers are there for dichloroprepe, C₃H₄Cl₂

• 3 A
• 5 B
• 6 C
• 7 D

A nuclophile must

• Be an atom A
• A group of atoms B
• Have a lone pair C
• Be negatively charged 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