ECAT Pre Engineering Chemistry Chapter 19 MCQ Test With Answer

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

Formula of chloroform is

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

Raney - nickel is the alloy of Ni with

• Pt A
• Al B
• Cu C
• Pd D

Which is symmetric alkene?

• CH=C-CH₂ A
• CH≡CH B
• CH₃-C≡C - CH₃ C
• B and C D

Formula of chloroform is:

• CH₃Cl A
• CCl₄ B
• CH₂Cl₂ C
• CHCl₃ D

Which gas is used for welding purposes

• Butane A
• Nitrogen B
• Methane C
• Acetylene D

The treatment of benzene with isobutene in the presence of sulphuric acid give

• isobutyl benzene A
• tert-Butyl benzene B
• n- Butyl benzene C
• no reaction D

The method used only for the production of symmetrical alkanes

• Kolb's method A
• Clemmenen B
• Cannizzaro C
• Wolf kishner 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

Aromatic hydrocarbons are the derivatives of

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

Alkenes combine readily with electrophillic reagents such as halogens giving

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

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

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

CnH_2nis the general formula of

• Alkanes A
• Alkanes B
• alkynes C
• None of above D

Preparation of vegetable ghee involves:

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

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

Complete combustion of alkane yields

• CO₂+ H₂O A
• CO₂+ heat B
• CO + H₂O heat C
• CO₂+ H₂O + heat 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

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

Which is more active ?

• Alkanes A
• Alkenes B
• Alkynes C
• Benzene D

Vinyl acetylene combines with HCI to form

• Poly acetylene A
• Benzene B
• Chloroprene C
• Divinylacetylene 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 hydrocarbon which is used as an illuminating agent

• Methane A
• Methene B
• Methyne C
• B & C D

Incomplete oxidation of alkanes yields

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

The empirical formula of benzene is determined by

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

All are ortho & Para directing except

• X A
• OH B
• NR₃ C
• NH₂ D

The molecule of ethane possess which hybrization

• sp³ A
• sp² B
• sp C
• sp²d D

C₁₈and onward hydrocarbons are normally

• Gases A
• Liquids B
• Solids C
• Plasma D

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

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