ECAT Pre Engineering Chemistry Chapter 19 MCQ Test With Answer

Alkanes containing carbon C₁₈ownwards are

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

Alkene general formula :

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

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

Synthetic rubber is made by polymerization of

• Chloroform A
• Acetylene B
• Divinlacetylene C
• Butene 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

Preparation of vegetable ghee involves:

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

Which is symmetric alkene?

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

Toluene is also called

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

De halogenatiion of tetrahalides happens in the presence of active metal like

• Zn A
• Mg B
• Both a and b C
• None of them D

Paraffins are also called

• Alkanes A
• Alkynes B
• Alkenes C
• None of these D

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

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

The hydrocarbons having double bonds normally end with suffix

• Ane A
• Ene B
• Yne C
• Oic D

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

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

When methane reacts with Cl₂in the presence of diffused light the products obtained are

• Chloroform only A
• Carbon tetrachloride only B
• Chloromethane and dichloromethane C
• Mixture of a, b, c D

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

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

Which of the following is not aromatic hydrogencarbon

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

A fuel has the same knocking property as a mixture of 70 isooctane (2, 2, 4- trimethyl pentane) and 30% n-heptane by volume the octane number of the fuel is

• 100 A
• 70 B
• 50 C
• 40 D

• 4-methyl pentene A
• 2-methyle-1-butene B
• 2-methyl propane C
• None of the above D

Mustard gas is a :

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

acetylene can be converted into-while passing through a Cu-tube at 300°C:

• Glyoxal A
• Vinyl acetylene B
• Vinyl alcohol C
• Benzene 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

In which one of the following compound rings are not fused together at ortho positions

• Phenanthrene A
• Naphthalene B
• Diphenyemethane C
• Anthracene D

For preparing an alkane, a concentrated aqueous solution of sodium or potassium salt of saturated carboxylic acid is subjected to

• Hydrolysis A
• Oxidation B
• Hydrogenation C
• Electrolysis D

An alkynes having Carbon count of 20 is

• gas A
• liquid B
• Solid C
• None D

Preparation of ethylbenzene by the reaction of bromobenzene, ethylbromide and sodium is called

• Wurtz reaction A
• Fitting reaction B
• Wurtz fitting reaction C
• None of these D

The elimination of HX from adjacent carbon atoms is called

• Halogenations A
• Hydrohalogenation B
• Dehydrohalogenation C
• Hydration D

The Total coal resources of Pakistan are estimated to be

• 184 billion A
• 184 million tones B
• 1.84 billion tounes C
• 1.84 million tonnes D

B-B'-dichloroethyl sulphide is commonly known as

• Mustard gas A
• Laughing gas B
• Phosgene gas C
• Bio gas D