ECAT Pre Engineering Chemistry Chapter 19 MCQ Test With Answer

Which is liquid among the following alkenes?

• Ethane A
• Propene B
• Butene C
• Pentene D

Marsh gas was the name given to

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

The benzene molecule contains

• Three double bonds A
• Two double bonds B
• One double bonds C
• Delocalizedπ-electron charge D

Substitution of halogen in the benzene ring requires catalyst

• AlCl₃ A
• FeCl₃ B
• SiO₂ C
• Organo - nickel D

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

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

When sodium benzoate is treated with soda lime (NaOH) benzene is formed. What is the other product

• Na₂CO₃ A
• NaHCO₃ B
• Ca(OH)₂ C
• CaCO₃ D

The order of reactivity of halogen acids towards alkenes

• HCl > HBr > Hl A
• HBr > HCl > HI B
• HCl > HBr C
• HI > HBr > HCl D

The hydrocarbons having double bonds normally end with suffix

• Ane A
• Ene B
• Yne C
• Oic D

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

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

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

When acetylene is passed through a copper tube at 300°C, it polymerizes to

• Polyacetylene A
• polyethylene B
• Benzene C
• None of these D

Which one of following is not monocyclic aromatic hydrocarbon

• Benzaldehyde A
• Benzoic acid B
• Benzene sulfonic acid C
• Biphenyl 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 compound was recognized the parent member of aromatic compounds

• Aniline A
• Phenol B
• Benzene C
• Toluene D

Ethylene decolorizes cold dilute solution of KMnO₄. This test is known as

• Colouration test A
• Baeyer's test B
• Silver mirror test C
• Ring test 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

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

• Polybenzene A
• Polyalcohol B
• Polypropylene C
• Polyethylene 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

Eletronegativity difference in C-C bond in alkanes is:

• Zero A
• Double B
• Half C
• 4.0 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 decolourizes the colour of Br₃

• CH₄ A
• CH_3-CH_3-CH₃ B
• CH₂₌CH₂ C
• CH_3-CH₃ 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

Benzene is prepared from n-hexane in the presence of catalyst

• Cr₂O₃ A
• Al₂O₃ B
• SiO₂ C
• All above D

The nitration of benzene takes place when it is heated with a mixture of conc.HNO₃and conc. H₂SO₄at 50°C in ratio of

• 1 : 2 A
• 1 : 1 B
• 1 : 3 C
• 2 : 1 D

Benzene does not undergo

• Substitution reaction A
• Addition reaction B
• Oxidation reaction C
• Elimination reaction D

Formula of chloroform is

• CH₃CI A
• CCI₄ B
• CH₂CI₂ C
• CHCI₃ D

The term aromatic was derives from

• Greek word A
• Latin B
• Russian C
• English 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

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

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

Which of the following decolorized Br₂-water

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