ECAT Pre Engineering Chemistry Chapter 19 MCQ Test With Answer

Cyclohexane can be converted not benzene in the presence of

• Pt at 100°C A
• Pt at 250°C B
• Pd at room temperature C
• Pt at room temperature D

The hydrocarbon used for polymerization is

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

A six membered ring containing one double bond called

• Cyclohexene A
• Cyclohexane B
• Cyclohexadiene C
• None D

Introduction of a second methyl group in methylbenzene will give how many isomeric dimethyllenzenes

• 2 A
• 1 B
• 3 C
• 4 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

Preparation of vegetable ghee involves

• Halogenations A
• Hydrogenation B
• Hydroxylation C
• Dehydrogenation D

Which of the following method is most appropriate for the manufacture of methane?

• By reduction of CH2CL2 A
• Wurtz reaction B
• Liquification of natural gas C
• None of these D

Benzene does not undergo

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

Which can be used for dehydration of alcohol

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

An alkynes having Carbon count of 20 is

• gas A
• liquid B
• Solid C
• None 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

Aromatic hydrocarbons are the derivatives of

• Normal series of paraffins A
• Alkene B
• Benzene C
• Cyclohexane D

The electrophile in aromatic sulphonation is

• H₂SO₄ A
• HSO₄ B
• SO₃ C
• SO₃⁺ 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 stability of acromatic compounds decreases with ------- in the no. of its resonance structure

• Decrease A
• Increase B
• Remain constant C
• Partially decreases D

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

• Polybenzene A
• Polyalcohol B
• Polypropylene C
• Polyethylene 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

Paraffins are also called

• Alkanes A
• Alkynes B
• Alkenes C
• None of these D

How many isomeric disubtituted products are obtained by the introducing of second group in the ring

• Two A
• Three B
• Four C
• None D

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

• Boiling points A
• Melting points B
• Density C
• Solubility 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 general formula of alkane is

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

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

Mustard gas is a :

• Gas A
• Liquid B
• Solid C
• High boiling point D

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

The carbon, carbon bond length in benzene is

• 1.54A° A
• 1.34A° B
• 1.20A° C
• 1.39A° 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

Alkenes combine readily with electrophillic reagents such as halogens giving

• Haloalkanes A
• Gem-dihalides B
• Vicinal dihalides C
• Vinyl halides D

Hydrocarbons are divided into aliphatic, alicyclic and aromatic which structure among the following show an alicyclic hydrocarbon

• 
  A
• 
  B
• 
  C
• 
  D

During nitration of benzene, the active nitrating agent is

• NO3 A
• NO2+ B
• NO2- C
• HNO3 D