ECAT Pre Engineering Chemistry Chapter 19 MCQ Test With Answer

All C - H bond lengths of benzene ring is

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

Which of the following is not an electrophitic substitution reaction of benzene

• Nitration A
• Sulphonation B
• Fridel-Craft alkylation C
• Free radical chlorination of benzene D

The simplest and the parent members of aromatic hydrocarbon is

• Benzene A
• Toluene B
• Biphenyis C
• Naphthalene D

Acetylene gives

• White ppt. with ammonical AgNO3 and red ppt. with ammonical Cu(NO3)2 A
• White ppt. with ammonical AgNO3 and red ppt. with ammonical Cu2C12 B
• White ppt. with both C
• Red ppt. with both D

Vinyl acetylene combines with HCl to form:

• Polyacetylene A
• Benzene B
• Chloroprene C
• Divinyl acetylene D

• Pent -1-ene-3-yne A
• 2-pentyne-4-ene B
• 1-pentene-3-yne C
• Pent-2-yen-4-ene D

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

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

Sulphuric acid generates nitronium ion by reacting with

• Nitric acid A
• Nitrogen gas B
• Nitrous acid C
• Potassium nitrate D

The geometry of acetylene is

• Angular A
• Bent B
• Trigonal C
• Linear D

Amongst the following the compound that can be most readily sulphonated is

• Toluene A
• Benzene B
• Nitrobenzene C
• Chlorobenzene D

Substituted phenyl groups are called

• acyl groups A
• phenyl groups B
• Aryl groups C
• Alkyle groups D

Synthesis of rubber is made by polymerization of

• Chloroform A
• Acetylene B
• Divinylacetylene C
• Butene D

Which can be used for dehydration of alcohol

• P₄O₁₀ A
• H₂SO₄ B
• H₃PO₄ C
• All of them 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

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

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

Which reaction is too vigorous to control

• Chlorination A
• Bromination B
• Iodination C
• Fluorination D

Most common reactions of benzene and its derivatives are

• electrophilic addition reactions A
• electrophilic substitution reactions B
• Nucleophilic addition reactions C
• Nucleophilic subtitution reactions D

Formula of chloroform is:

• CH₃Cl A
• CCl₄ B
• CH₂Cl₂ C
• CHCl₃ 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

Alkyne is :

• CH_3-CH₃ A
• CH₄ B
• CH₂₌CH₂ C
• C₂H₂ D

Which class of compound is more reactive

• Alkane A
• Alkene B
• Alkyne C
• None D

Octane number can be changed by

• Isomerisation A
• Alkylation B
• Cyclisation C
• All of these D

Alkynes are colourless & odouless except

• Acetylene A
• Propyne B
• Butyne C
• Pentyne 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

Alkanes have functional group :

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

Which of the following substances is used as an antiknock compound?

• Tetraethyl lead A
• Lead tetrachloride B
• Lead acetate C
• Ethyle acetate D

The term aromatic was derives from

• Greek word A
• Latin B
• Russian C
• English D

The compound prepared by a substitution reaction of benzene is

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

Write the name of following alkene CH₂= CH - CH = CH₂

• 1,3 butadiene A
• Butra -1, 3-diene B
• Both a & b C
• None D

How many isomeric disubtituted products are obtained by the introducing of second group in the ring

• Two A
• Three B
• Four C
• None D