ECAT Pre Engineering Chemistry Chapter 19 MCQ Test With Answer

Hybridization in alkanes is:

• sp A
• sp² B
• sp³ C
• dsp² D

Incomplete oxidation of alkanes yields

• CO₂& carbon black A
• CO₂+ heat B
• CO and carbon black C
• CO + heat D

Which is liquid among the following alkenes?

• Ethane A
• Propene B
• Butene C
• Pentene D

The reaction-method that does not give an alkane is

• Catalytic hydrogenation of alkanes A
• Wurtz reaction B
• Hydrolysis of alkyl magnesium bromide C
• Dehydrohalogenation of an alkyl halide D

Which one gives acidic reactions?

• CH₃----C≡C-------CH₃ A
• CH₃-----CH₂-----HC=CH----CH₂ B
• CH₃----CH=CH₂ C
• CH₃-----C≡CH 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

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

• CO A
• CO₂₊H₂O B
• H₂CO₃ C
• None D

Alkene general formula :

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

The difference between amount of heat actually released and that of calculated is called

• Bonding energy A
• Activation energy B
• Resonance energy C
• Transition energy D

Formula of chloroform is:

• CH₃Cl A
• CCl₄ B
• CH₂Cl₂ C
• CHCl₃ D

Toluene is also called

• Hydroxyl benzene A
• Methyl benzene B
• ethyl benzene C
• None D

Which reaction sequence would be best to prepare 3-chloro-aniline from benzene?

• Chlorination, nitration, reducing A
• Nitration, chlorination, reducition B
• Nitration, reduction,chlorination C
• Nitration, reduction, acylation, chlorination, hydrolysis D

Alkyl halides when reduced with nascent hydrogen in the presence of Zn + HCI, are converted to

• Alkynes A
• Alkenes B
• Alkanes C
• Alcohol 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

When n-hexane is heated in the presence of Pt at 500°C, it cyclists to give

• Benzene A
• Cyclohexene B
• Benzene C
• Toluene D

Benzene does not undergo polymerization and it is also resistant to

• Reduction A
• Oxidation B
• Alkylation C
• Ozonolysis D

Boiling point of n-butane is:

• -102°C A
• -75°C B
• -55°C C
• 55°C 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

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

Aromatic hydrocarbons are the derivatives of

• Normal series of paraffins A
• Alkene B
• Benzene C
• Cyclohexane D

Benzene is obtained from benzene sulphonic acid by treating with

• HCl A
• NaOH B
• H₂O C
• NaHCO₃ D

Which is the used as test for the presence of alkenes

• Reaction of cold dilute alkaline KMnO₄ A
• Combustion B
• Polymerization C
• Catalytic hydrogenation D

The compound prepared by a substitution reaction of benzene is

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

Catalytic oxidation of alkanes is used for the preparation of

• Adehydes A
• Ketones B
• Fatty acid C
• Carbonyylic acids D

Raney - nickel is the alloy of Ni with

• Pt A
• Al B
• Cu C
• Pd D

A six membered ring containing one double bond called

• Cyclohexene A
• Cyclohexane B
• Cyclohexadiene C
• None D

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

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

Eletronegativity difference in C-C bond in alkanes is:

• Zero A
• Double B
• Half C
• 4.0 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

Benzene is not prepared from

• Acetylene A
• Phenol B
• Benzoic acid C
• Bromo benzene D