ECAT Pre Engineering Chemistry Chapter 19 MCQ Test With Answer

The elimination of HX from adjacent carbon atoms is called

• Halogenations A
• Hydrohalogenation B
• Dehydrohalogenation C
• Hydration D

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

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

Hydrogenation of alkenes/alkynes inthe presence of Ni as catalyst at 3000°C result in the formation of corresponding alkanes. This reaction is known as

• Sabatier-senderens reaction A
• kolbes reaction B
• Cannizaro's reaction C
• Haloform reaction D

Alkenes combine readily with electrophillic reagents such as halogens giving

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

When n-hexane is heated in the presence of Pt at 500°C, it cyclists to give

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

The general formula of alkane is

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

Odour of alkene is:

• Fruity A
• Odourless B
• Zarlic like C
• Irritating 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

The Total coal resources of Pakistan are estimated to be

• 184 billion A
• 184 million tones B
• 1.84 billion tounes C
• 1.84 million tonnes D

Alkanes are soluble in all except

• Benzene A
• Ether B
• Water C
• Carbon tetra chloride 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

β-β- dichloroethyle sulphide is commonly known as:

• Mustared gas A
• Laughing gas B
• Phosgene gas C
• Bio gas D

The three alternate single and double bonds in the benzene ring are called

• Conjugate bonds A
• Resonating bonds B
• Both A and B C
• None of above D

A fuel has the same knocking property as a mixture of 70 isooctane (2, 2, 4- trimethyl pentane) and 30% n-heptane by volume the octane number of the fuel is

• 100 A
• 70 B
• 50 C
• 40 D

Which of the following substances is used as an antiknock compound?

• Tetraethyl lead A
• Lead tetrachloride B
• Lead acetate C
• Ethyle acetate 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

Incomplete oxidation of alkanes yields

• CO₂& carbon black A
• CO₂+ heat B
• CO and carbon black C
• CO + heat D

Which of the following is not an ortho-para directing group

• 
  A
• 
  B
• 
  C
• 
  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 one of the following gases is used for artificial ripening of fruits

• Ethane A
• Ethyne B
• Methane C
• Propane 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 reaction is characteristic of benzene

• Electrophilic substitution reaction A
• Reduction B
• Oxidation C
• Ozonolysis D

• 2, 3-dimethylbutane A
• 2, 3-methylbutane B
• 2-dimethylbutane C
• Dimethylbutane D

Which decolourizes the colour of Br₃

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

Preparation of vegetable ghee involves

• Halogenations A
• Hydrogenation B
• Hydroxylation C
• Dehydrogenation 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

The temp. used for the hydrogenation of alkenes using Ni is

• 2000°C A
• 400°C B
• 200-- 300°C C
• 1000°C D

Alkyl benzenes are readily oxidized by axidfied

• KMnO₄ A
• K₂CO₃ B
• MnO₄ C
• H₂SO₄ D

In Friedal-Craft's alkylation besides AlCl3 the other reactants are

• C6H6 + NH3 A
• C6H6 + NH4 B
• C6H6 + CH3Cl C
• C6H6 + CH3COCl D

Which one does not declourized KMnO₄

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