ECAT Pre Engineering Chemistry Chapter 19 MCQ Test With Answer

Octane number is zero for

• n-Heptane A
• Isooctane B
• n-Hexane C
• Isoheptane D

Which of the following acid can be used as a catalyst in Friedal Craft's reactions

• AlCl₃ A
• HNO₃ B
• BeCl₂ C
• NaCl D

Which is the used as test for the presence of alkenes

• Reaction of cold dilute alkaline KMnO₄ A
• Combustion B
• Polymerization C
• Catalytic hydrogenation D

The electrophile in aromatic sulphonation is

• H₂SO₄ A
• HSO₄ B
• SO₃ C
• SO₃⁺ 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

When benzene is burnt in free supply of air, it is completely oxidized to

• CO A
• CO₂₊H₂O B
• H₂CO₃ C
• None D

During nitration of benzene, the active nitrating agent is

• NO3 A
• NO2+ B
• NO2- C
• HNO3 D

"Each different compound should have a different name" was published by IUPAC system of nomenclature in

• 1892 A
• 1830 B
• 1947 C
• 1979 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

Which class of compound is more reactive

• Alkane A
• Alkene B
• Alkyne C
• None D

The correct order of reactivity of halogens with alkanes is

• l₂> Br₂> Cl₂> F₂ A
• l₂> Cl₂> F₂> Br₂ B
• F₂> Cl₂> l₂> Br₂ C
• F₂> Cl₂> Br₂> l₂ D

The general formula of alkane is

• C_nH_2n+2 A
• C_nH_n B
• C_nH_2n C
• C₂H_2n-1 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

Ethylene polymerizes at 100 atm pressure and 400°C to give

• Polybenzene A
• Polyalcohol B
• Polypropylene C
• Polyethylene D

All are ortho & Para directing except

• X A
• OH B
• NR₃ C
• NH₂ D

Ethylene combines with water in the presence of H₂SO₄+ HgSO₄and forms

• Ethyle chloride A
• Ethyle alcohol B
• Carboxylic acid C
• None of these D

Which can be used for dehydration of alcohol

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

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

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

Synthesis of rubber is made by polymerization of

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

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

• Saturation A
• Unsaturation B
• Subsitution C
• None D

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

Acetylene is used in the manufacture of

• Rubber A
• Plastic B
• Ethyle alcohol C
• All of these 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

An alkynes having Carbon count of 20 is

• gas A
• liquid B
• Solid C
• None D

The molecule of ethane possess which hybrization

• sp³ A
• sp² B
• sp C
• sp²d D

Alkenes normally have ______ geometry

• Tetrachedral A
• Linear B
• Planer C
• None D

Alkynes are colourless & odouless except

• Acetylene A
• Propyne B
• Butyne C
• Pentyne D

Sp³hybird orbitals are oriented at an angle of

• 107.5° A
• 108.5° B
• 109.5° C
• 103.5° D

The geometry of acetylene is

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