ECAT Pre Engineering Chemistry Chapter 18 MCQ Test With Answer

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

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

• 1, 5-pentadiene A
• Penta-1, 4-diene B
• 1, 1-pentadiene C
• 1, 4-pentene D

Homologues differ from each other by an integral number of

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

• Condensation A
• Dehydration B
• Dehydrogenation C
• Hydrogenation 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

n-butane and iso butane are an example of

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

Which is not a nucleophile

• Benzene A
• Chlorine B
• Ethene C
• Ethanol D

Peat contains about

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

• 2, 2, 4-trimethylpentane A
• 2, 4, 4-trimethylpentane B
• 2, 4, 4-methyepentane C
• 2, 2, 4-methylpentane D

The gasoline having octane No. 100 has ______

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

Which of the following contains single bonds

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

Wholer prepared urea from

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

Acetylene had a characteristic ethereal smell resembling that of

• Ginger A
• Vinegar B
• Garlic C
• Onion D

The use of tetra ethyl lead in petrol as an efficient antiknock agent is being discouraged. Which reason is correct

• It is costly A
• It damages the engine B
• Pb is difficult to obtain in bulk quantities C
• The combustion product, lead, causes air pollutions D

In t-butyl alcohol, the tertiary carbon is bonded to:

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

Which of the following gases is used for illuminating purpose?

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

Quality of fuel is judged from its octane number. The best fuels are

• Straight chain hydrocarbons A
• Branched chain hydrocarbons B
• Cyclic compounds C
• Compounds containing benzene ring D

Which one of the followings is a heterocyclic compound

• Cyclohexanol A
• Phenol B
• Pyridine C
• Anthracene D

Which of the following posses linear geometry

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

Which of the following is an electrophile

• Bromine A
• KBr B
• NH₃ C
• Benzene D

Who rejected the vital force theory

• Wholer A
• Fisher B
• Newton C
• Lewis D

The formula of esters is

• 
  A
• 
  B
• 
  C
• 
  D

Closed chain compound can be classified into

• Homocyclic A
• Hetrocyclic B
• Aliphatic C
• Both a and b D

The general formula for alkenes is

• C_nH_2n+1 A
• C_nH_2n+2 B
• C_nH_2n C
• C_nH_2n-2 D

• 1 A
• 2 B
• 3 C
• 4 D

Which set of hybrid orbitals has planar triangle shape?

• sp³ A
• sp B
• sp² C
• dsp² D

Number of isomers of butane are:

• One A
• Two B
• Three C
• Four D

Fossil fuels consist of :

• Coal A
• Natural gas B
• Petroleum C
• All of these D

Due to the bacterial action on wood it is converted into

• Peat A
• Lignite B
• Bituminous coal C
• Anthracite 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