ECAT Pre Engineering Chemistry Chapter 19 MCQ Test With Answer

Synthetic rubber is made by polymerization of

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

The simplest and the parent members of aromatic hydrocarbon is

• Benzene A
• Toluene B
• Biphenyis C
• Naphthalene 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

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

Which of the following species participate in sulphonation of benzene ring?

• H2SO4 A
• HSO4 B
• SO3 C
• SO^-₂ 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

Which of the following is an ortho-para directing group

• 
  A
• 
  B
• 
  C
• 
  D

Kolb's method has limited synthetic applications due to

• Expensive catalysis A
• Slow reaction B
• Number of side products produced C
• Salts used are very expensive D

A six membered ring containing one double bond called

• Cyclohexene A
• Cyclohexane B
• Cyclohexadiene 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

The method involved for electrolysis of Na or K salts of carboxylic acids

• Sabatier's sendrens reaction A
• Kolbe's method B
• Clemmensen C
• Wolf kishner reduction 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

Which one of the following gases is used for artificial ripening of fruits

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

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

• Hund's rule A
• Markownikov's rule B
• Pauli's Exclusion Principle C
• Auf bau Principle D

Octane number is zero for

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

Catalytic oxidation of alkanes is used for the preparation of

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

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

A single benzene ring can have ______ ortho position maximally

• One A
• Two B
• Three C
• Four D

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

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

The electrophile in aromatic sulphonation is

• H₂SO₄ A
• HSO₄ B
• SO₃ C
• SO₃⁺ 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

Replacement of hydrogen by NO₂group is called

• Sulphonatioin A
• Hydration B
• Nitration C
• Cracking D

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

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

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

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

How many molecules of chlorine adds in benzene in the presence of sunlight

• One A
• Two B
• Three C
• Four D

Hybridization of each carbon atom in benzene ring is

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

The hydrocarbons having double bonds normally end with suffix

• Ane A
• Ene B
• Yne C
• Oic D

The empirical formula of benzene is determined by

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