ECAT Pre Engineering Chemistry Chapter 19 MCQ Test With Answer

The four bonds of carbon in methane are directed towards the corners of

• Cube A
• Pentagon B
• Hexagon C
• Tetrahedron D

The major reaction occurring in the engines of automobiles is

• Oxidation A
• Reducing B
• Combustion C
• Decomposition D

The elimination of HX from adjacent carbon atoms is called

• Halogenations A
• Hydrohalogenation B
• Dehydrohalogenation C
• Hydration D

Kolb's method has limited synthetic applications due to

• Expensive catalysis A
• Slow reaction B
• Number of side products produced C
• Salts used are very expensive D

The compound prepared by a substitution reaction of benzene is

• Acetophenone A
• Glyoxal B
• Cyclohexame C
• Hexabromo cyclohexane D

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

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

The process in which orbitals of different energies and shapes mix with each other to give equivalent hybrid orbitals is called

• Isomerization A
• polymerization B
• Hybridization C
• Resonance D

Benzene is obtained from benzene sulphonic acid by treating with

• HCl A
• NaOH B
• H₂O C
• NaHCO₃ D

Alkanes are soluble in all except

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

Synthesis rubber is made by polymerization :

• Chloroform A
• Acetylene B
• Divinyl acetylene C
• Butene D

Alkenes normally have ______ geometry

• Tetrachedral A
• Linear B
• Planer C
• None D

Which one of following is not monocyclic aromatic hydrocarbon

• Benzaldehyde A
• Benzoic acid B
• Benzene sulfonic acid C
• Biphenyl D

All C - H bond lengths of benzene ring is

• 1.07A° A
• 1.09A° B
• 1.08A° C
• None D

Hybridization in alkanes is:

• sp A
• sp² B
• sp³ C
• dsp² 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

A salt producing hydrocarbon among these compounds is

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

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

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

During nitration of benzene, the active nitrating agent is

• NO3 A
• NO2+ B
• NO2- C
• HNO3 D

• 2-bromonitrobenzene A
• 2-nitrobromobenzene B
• 1-bromonitrobenzene C
• 1-nitrobromobenzene D

Which gas is produced by treating CaC₂with water

• Methane A
• Ethane B
• Acetylene C
• HCI D

The reaction in which ketone is reduced to the alkane is called

• Kolb A
• Clemmensen B
• Cannizzaro C
• None D

When methane reacts with Cl₂in the presence of diffused light the products obtained are

• Chloroform only A
• Carbon tetrachloride only B
• Chloromethane and dichloromethane C
• Mixture of a, b, c D

The alkynides are used for the ----------- of alkynes

• Pxperation A
• Purification B
• Seperation C
• All of above D

An alkane is produced when an alkyle halide reacts with zinc in the presence of

• HCl A
• CH₃COOH B
• Both a & b C
• None D

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

• CO A
• CO₂₊H₂O B
• H₂CO₃ C
• None D

Hybridization of each carbon atom in benzene ring is

• sp hybridized A
• sp²hybridized B
• sp³ C
• dsp² D

The carbon, carbon bond length in benzene is

• 1.54A° A
• 1.34A° B
• 1.20A° C
• 1.39A° D

The simplest and the parent members of aromatic hydrocarbon is

• Benzene A
• Toluene B
• Biphenyis C
• Naphthalene 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

Cyclohexane can be converted not benzene in the presence of

• Pt at 100°C A
• Pt at 250°C B
• Pd at room temperature C
• Pt at room temperature D