ECAT Pre Engineering Chemistry Chapter 19 MCQ Test With Answer

Which can be used for dehydration of alcohol

• P₄O₁₀ A
• H₂SO₄ B
• H₃PO₄ C
• All of them D

The saturated hydrocarbons usually end with suffix ______

• Ane A
• Ene B
• Yne C
• Oic D

Acetylene gives

• White ppt. with ammonical AgNO3 and red ppt. with ammonical Cu(NO3)2 A
• White ppt. with ammonical AgNO3 and red ppt. with ammonical Cu2C12 B
• White ppt. with both C
• Red ppt. with both D

Which one does not declourized KMnO₄

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

Benzene is not prepared from

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

Which of the following decolorized Br₂-water

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

Zn + HCI are used in

• Clemenson reduction A
• Wof kishner reduction B
• Kolb's electrolysis C
• Wutruz reaction D

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

• Physical activity A
• Chemical reactivity B
• Density C
• None 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 one of the following gases is used for artificial ripening of fruits

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

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

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

Which of the following is not aromatic hydrogencarbon

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

The next homologue of C₁₀H₂₂will be

• C₉H₂₀ A
• C₁₂H₂₆ B
• C₁₁H₂₄ C
• C₁₃H₂₈ 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

Alkene general formula :

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

All are ortho & Para directing except

• X A
• OH B
• NR₃ C
• NH₂ D

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

The reaction in which ketone is reduced to the alkane is called

• Kolb A
• Clemmensen B
• Cannizzaro C
• None D

The major reaction occurring in the engines of automobiles is

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

The hydrocarbon used for polymerization is

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

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

• Hund's rule A
• Markownikov's rule B
• Pauli's Exclusion principle C
• Auf ban principle D

During nitration of benzene, the active nitrating agent is

• NO3 A
• NO2+ B
• NO2- C
• HNO3 D

During the preparation of alkynes the active metals that react with tetra halo-alkanes are

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

Vinyl acetylene combines with HCl to form:

• Polyacetylene A
• Benzene B
• Chloroprene C
• Divinyl acetylene D

Th IUPAC name of the compound having formula (CH3) 3 C - CH = CH2 is

• 1, 1-Dimethyl-3-butene A
• 1,1,1-Trimethyl-3-propene B
• 3,3,-Dimenthyl-1-butene C
• 3,3,3,-Trimethyl-1-propene D

Synthetic rubber is made by polymerization of

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

When alkyl is treated with chlorine in the presence of sunlight

• 1,3 dichloroproduct is formed A
• 1,4 dichloro product is formed B
• 1,3,5 trichloro product is formed C
• Only alkyl group is substituted D

Alkanes are generally not reactive towards acids, alkalis, oxidation or reuducing agents. They however undergo some reactions, which one is the reaction undergone by alkanes

• Elemination A
• Addition B
• Free radical substitution C
• Nucleophilic substation 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