ECAT Pre Engineering Chemistry Chapter 19 MCQ Test With Answer

β-β- dichloroethyle sulphide is commonly known as:

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

The simplest and the parent members of aromatic hydrocarbon is

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

Alkanes containing carbon C₁₈ownwards are

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

Synthetic rubber is made by polymerization of

• Chloroform A
• Acetylene B
• Divinlacetylene C
• Butene D

All C - H bond lengths of benzene ring is

• 1.07A° A
• 1.09A° B
• 1.08A° C
• None 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

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

In CH₄, all the H-C-H bond angles are

• 120° A
• 107° B
• 109° C
• 109.5° D

The hydrocarbons having double bonds normally end with suffix

• Ane A
• Ene B
• Yne C
• Oic D

Alkanes have functional group :

• ----X A
• --OH B
• ----COH C
• No functional group D

Hybridization of each carbon atom in benzene ring is

• sp hybridized A
• sp²hybridized B
• sp³ C
• dsp² 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

When an aqueous solution of potassium salt of monocarboxylic acid is subjected to electrolysis, corresponding alkane is formed. This reation is known as

• Cannizaro reaction A
• Sabatier-secderens reaction B
• Alkylation C
• Kolbe's reaction D

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

• Hund's rule A
• Markowvikov's rule B
• Pauli's exclusion principle C
• Auf ban principle D

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

Polymerization of ethane take place at pressure of 100 atm and a temperature of

• 200°C A
• 400°C B
• 600°C C
• 800°C 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

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

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

Incomplete oxidation of alkanes yields

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

Synthesis of rubber is made by polymerization of

• Chloroform A
• Acetylene B
• Divinylacetylene C
• Butene D

Boiling point of n-butane is:

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

Substituted phenyl groups are called

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

Catalytic oxidation of alkanes is used for the preparation of

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

Hybridization in alkanes is:

• sp A
• sp² B
• sp³ C
• dsp² 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 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

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