ECAT Pre Engineering Chemistry Chapter 19 MCQ Test With Answer

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

• Saturation A
• Unsaturation B
• Substitution C
• None of above D

C₁₈and onward hydrocarbons are normally

• Gases A
• Liquids B
• Solids C
• Plasma D

Formula of chloroform is

• CH₃CI A
• CCI₄ B
• CH₂CI₂ C
• CHCI₃ 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

Which is liquid among the following alkenes?

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

Mustard gas is a

• Gas A
• High boiling speed B
• High melting liquid C
• Steam D

A single benzene ring can have ______ ortho position maximally

• One A
• Two B
• Three C
• Four D

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

• H₂SO₄ A
• Ni B
• Fe₂O₃ C
• Al₂O₃ D

The carbon, carbon bond length in benzene is

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

Benzene does not undergo

• Substitution reaction A
• Addition reaction B
• Oxidation reaction C
• Elimination reaction 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

Which one of following is not monocyclic aromatic hydrocarbon

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

What is not a common use of methane

• As a fuel A
• For the preparation of haloaklanes B
• For the preparation of methyl alcohol C
• For the preparation of sulphuric acid 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

The addition of unsymmetrical reagent to unsymmetrical alkene is in accordance with the rule:

• Hund's rule A
• Markownikov's rule B
• Pauli's Exclusion Principle C
• Auf bau Principle D

Sulphuric acid generates nitronium ion by reacting with

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

Which decolourizes the colour of Br₃

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

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

• One A
• Two B
• Three C
• Four D

The hydrocarbon used for polymerization is

• Alkanes A
• Alkenes B
• Alkynes C
• All of above D

To differentiate isomers we use

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

The temp. used for the hydrogenation of alkenes using Ni is

• 2000°C A
• 400°C B
• 200-- 300°C C
• 1000°C 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

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

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

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

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

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

Substituted phenyl groups are called

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

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

Which of the following possesses the highest melting point?

• Chlorobenzene A
• 0-Dichlorobenzene B
• m-Dichlorobenzene C
• p-Dichlorobenzene D

Alkanes containing carbon C₁₈ownwards are

• Gases A
• Liquids B
• Waxy solids C
• Solids D