ECAT Pre Engineering Chemistry Chapter 19 MCQ Test With Answer

Which of the following species participate in sulphonation of benzene ring?

• H2SO4 A
• HSO4 B
• SO3 C
• SO^-₂ D

Preparation of vegetable ghee involves:

• Halogenation A
• Hydrogenation B
• Hydroxylation C
• Dehydrogenation D

During the preparation of alkanes the hydrogenation of alkenes or alkynes the catalyst may be

• H₂SO₄ A
• Ni B
• Fe₂O₃ C
• Al₂O₃ 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

Mustard gas is a :

• Gas A
• Liquid B
• Solid C
• High boiling point D

Alkyl benzenes are readily oxidized by axidfied

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

An alkynes having Carbon count of 20 is

• gas A
• liquid B
• Solid C
• None D

An organic compound, on treatment with Br2 in CC14 gives bromoderivative of an alkene. The compound will be

• CH3 - CH = Ch2 A
• CH3CH = CHCH3 B
• HC = CH C
• H2C = CH2 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

Octane number is zero for

• n-Heptane A
• Isooctane B
• n-Hexane C
• Isoheptane D

The order of dehydration of alcohol

• 10> 20> 30 A
• 10> 30> 20 B
• 20> 30> 10 C
• 30> 20> 10 D

The saturated hydrocarbons usually end with suffix ______

• Ane A
• Ene B
• Yne C
• Oic D

Benzene is not prepared from

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

Which is symmetric alkene?

• CH=C-CH₂ A
• CH≡CH B
• CH₃-C≡C - CH₃ C
• B and C D

A single benzene ring can have ______ ortho position maximally

• One A
• Two B
• Three C
• Four D

Hydrogenation of alkenes/alkynes inthe presence of Ni as catalyst at 3000°C result in the formation of corresponding alkanes. This reaction is known as

• Sabatier-senderens reaction A
• kolbes reaction B
• Cannizaro's reaction C
• Haloform reaction D

Alkynes are colourless & odouless except

• Acetylene A
• Propyne B
• Butyne C
• Pentyne D

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

• One A
• Two B
• Three C
• Four D

Free radical mechanism of halogenation of alkanes follow step:

• Initiation A
• Propagation B
• Termination C
• All of these D

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

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

Which of the following method is most appropriate for the manufacture of methane?

• By reduction of CH2CL2 A
• Wurtz reaction B
• Liquification of natural gas C
• None of these D

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

The stability of acromatic compounds decreases with ------- in the no. of its resonance structure

• Decrease A
• Increase B
• Remain constant C
• Partially decreases D

The hydrocarbons having double bonds normally end with suffix

• Ane A
• Ene B
• Yne C
• Oic D

Which of the following reaction is characteristic of benzene

• Electrophilic substitution reaction A
• Reduction B
• Oxidation C
• Ozonolysis D

Meta directing group decreased the ----------- of benzene ring

• Physical activity A
• Chemical reactivity B
• Density C
• None D

The presence of a double bond in a compound in the sign of:

• Saturation A
• Unsaturation B
• Subsitution C
• None D

Benzene is obtained from benzene sulphonic acid by treating with

• HCl A
• NaOH B
• H₂O C
• NaHCO₃ D

Introduction of a second methyl group in methylbenzene will give how many isomeric dimethyllenzenes

• 2 A
• 1 B
• 3 C
• 4 D

Synthesis rubber is made by polymerization :

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