ECAT Pre Engineering Chemistry Chapter 19 MCQ Test With Answer

If we remove one hydrogen atom from an alkane we obtain a group called

• Acetyle group A
• Formyle group B
• Alkyle group C
• Ketyle group 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

The major reaction occurring in the engines of automobiles is

• Oxidation A
• Reducing B
• Combustion C
• Decomposition D

Preparation of vegetable ghee involves

• Halogenations A
• Hydrogenation B
• Hydroxylation C
• Dehydrogenation 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

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

• H₂SO₄ A
• Ni B
• Fe₂O₃ C
• Al₂O₃ 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

The geometry of acetylene is

• Angular A
• Bent B
• Trigonal C
• Linear D

Alkene general formula :

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

The molecule of ethane possess which hybrization

• sp³ A
• sp² B
• sp C
• sp²d D

Write the name of following alkene CH₂= CH - CH = CH₂

• 1,3 butadiene A
• Butra -1, 3-diene B
• Both a & b C
• None 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 elimination of HX from adjacent carbon atoms is called

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

Which class of compound is more reactive

• Alkane A
• Alkene B
• Alkyne C
• None 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

Which of the following is not an electrophitic substitution reaction of benzene

• Nitration A
• Sulphonation B
• Fridel-Craft alkylation C
• Free radical chlorination of benzene 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

Substituted phenyl groups are called

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

Benzene does not undergo polymerization and it is also resistant to

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

The addition of HBr is easiest with

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

The order of dehydration of alcohol

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

• Pent -1-ene-3-yne A
• 2-pentyne-4-ene B
• 1-pentene-3-yne C
• Pent-2-yen-4-ene D

Benzene was discovered by Michael Faraday's in

• 1824 A
• 1825 B
• 1826 C
• 1827 D

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

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

Physical properties of alkanes increase with increase of all physical constants except

• Boiling points A
• Melting points B
• Density C
• Solubility D

Which one does not declourized KMnO₄

• Alkenes A
• Alkynes B
• Bezene C
• All above D

Octane number can be changed by

• Isomerisation A
• Alkylation B
• Cyclisation C
• All of these D

The empirical formula of benzene is determined by

• IR spectra A
• U.V B
• Elemental analysis C
• NMR spectra D

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

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