ECAT Pre Engineering Chemistry Chapter 19 MCQ Test With Answer

Sulphuric acid generates nitronium ion by reacting with

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

• 2, 3-dimethylbutane A
• 2, 3-methylbutane B
• 2-dimethylbutane C
• Dimethylbutane D

When sodium benzoate is treated with soda lime (NaOH) benzene is formed. What is the other product

• Na₂CO₃ A
• NaHCO₃ B
• Ca(OH)₂ C
• CaCO₃ D

Which gas is produced by treating CaC₂with water

• Methane A
• Ethane B
• Acetylene C
• HCI 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

A six membered ring containing one double bond called

• Cyclohexene A
• Cyclohexane B
• Cyclohexadiene C
• None 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

The three alternate single and double bonds in the benzene ring are called

• Conjugate bonds A
• Resonating bonds B
• Both A and B C
• None of above D

Ethylene can be prepared in the laboratory by heating together ethyl alcohol and

• HCI A
• Phenol B
• HF C
• H₂SO₄ D

Benzene can be obtained by heating either benzoic acid with X or phenol with Y. X and Y are respectively

• Zinc dust and soda lime A
• Soda time and zinc dust B
• Zinc dust and sodium hydroxide C
• Soda lime and copper D

Alkenes combine readily with electrophillic reagents such as halogens giving

• Haloalkanes A
• Gem-dihalides B
• Vicinal dihalides C
• Vinyl halides D

Substituted phenyl groups are called

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

The addition of HBr is easiest with

• CH2 = CHCl A
• CICH = CHCl B
• CH3 - CH = CH2 C
• (CH3)2 C = CH2 D

The molecule of ethane possess which hybrization

• sp³ A
• sp² B
• sp C
• sp²d D

How many molecules of chlorine adds in benzene in the presence of sunlight

• One A
• Two B
• Three C
• Four D

Benzene reacts with ozone and gives

• Glycerin A
• Glyoxal B
• Maleic anhydride C
• Benzoic acid D

Which one of the following is (m-xylene)

• 1,2 dimethyl benzene A
• 1,3 dimethyl benzene B
• 1,5 dimethyl benzene C
• 1,4 dimethyl benzene D

Which is more active ?

• Alkanes A
• Alkenes B
• Alkynes C
• Benzene D

Kolb's method is not useful for the production of

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

Hybridization in alkanes is:

• sp A
• sp² B
• sp³ C
• dsp² D

To differentiate isomers we use

• n- A
• iso- B
• neo C
• All of them D

Benzene is obtained by fractional distillation of

• Heavy oil A
• Anthracene oil B
• Middle oil C
• Light oil D

Replacement of hydrogen by NO₂group is called

• Sulphonatioin A
• Hydration B
• Nitration C
• Cracking D

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

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

Alkyl benzenes are readily oxidized by axidfied

• KMnO₄ A
• K₂CO₃ B
• MnO₄ C
• H₂SO₄ D

the unreactivity of alkanes is based upon

• Inertness of sigma bond A
• Non-polarity of the bonds B
• Both A and B C
• None 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

Alkyne is :

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