organic chemistry: Alkenes and Alkynes – quiz 6

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organic chemistry: Alkenes and Alkynes - quiz 6

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(36) The volume of gases produced from the thermal cracking reaction  ………… are greatest

(a) C6H14(g) >>> 3C2H4(g) + H2(g).

(b)C8H18(g) >>> 2C3H8(g) + C2H2 (g)

(c) C10H22(g)  >>> C8H18(g) + C2H4(g)

(d) C12H26(g)   >>> C8H18(g) + 2 C2H4(g)

 

 

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(34) The gas which is obtained from thermal catalytic cracking of octadecane C18H38 is  ……….

(a) CO₂ 

(b) C18H36  

(c) C36H74 

(d) C9H18.

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(33) Both of ………. are obtained from the thermal catalytic cracking of octane.

(a) hexane and ethane

(b) Butene and butane.

(c) heptane and methane

(d) propane and pentane

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(32) Chlorine reacts with methane gas forming …………. in the presence of ultraviolet rays.

(a) chloromethane and hydrogen

(b) chloromethane and Hydrogen chloride

(c) dichloromethane and hydrogen

(d) dichloromethane and trichloromethane

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31 ) Freons are used in air conditions and fridges, because they are ………..

(a) cheap.

(b) liquefied easily.

(c) non-poisonous and don't cause erosion.

(D) (a), (b) and (c).

 

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(30) The molecular formula of chloroform is ………..

(a) CCl4  

(b) CH2Cl₂  

(c) CH4  

(d) CHCI3.

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(29) Alkanes react with halogens in the presence of ultraviolet rays by

(a) elimination.

(b) condensation.

(c) Substitution.

(d) reduction.

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(28) The gas which burns in air forming two gases; one of them turns the clear limewater turbid and the other turns the anhydrous copper (II) sulphate into blue is …….

(a) Ethane.

(b) carbon monoxide

(c) hydrogen

(d) gasoline

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 (27) Alkanes which contain more than 17 carbon atoms are exist in state.

(a) Solid 

(b) liquid 

(c) vapour 

(d) gaseous

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(26) The boiling point of butane is less than that of ……….

(a) ethane.

(b) propane.

(c) methane.

(d) Hexane

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(25) In hot countries, the fuel cylinders contain large amount of ………  gas.

(a) ethane

(b) propane 

(c) Butane 

(d) pentane

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(24) In cold countries, the fuel cylinders contain high amount of

(a) methane

(b) ethane  

(c) Propane.

(d) butane

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(23) Which of the following compounds have the highest boiling point?.......

(a) Normal Hexane..

(b) Normal pentane.

(c) 2,2-dimethyl propane.

(d) 2-methyl butane

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(22) Gasoline consists of compounds which contain  …….. carbon atoms

(a) from 1:4  

(b) from 4:5

(c) from 5:17.  

(d) more than 17

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(21) Soda lime is a mixture of ……..

(a) caustic soda and calcium carbonate

(b) caustic soda and Quick lime

(c) sodium carbonate and quick lime

(d) caustic soda and slaked lime

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(20) The dry distillation of anhydrous sodium acetate with soda lime produces ……

(a) ethane. 

(b) Methane. 

(c) propane

(d) butane

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(19) The boiling point of ……….. is less than that of the other three compounds

(a)C2H6 .      

(b) CH3(CH₂)2CH3 

(c)CH3(CH2)4CH3

(d)C8H18

 

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(18) With increasing  the molecular mass in alkanes, the property ……….  doesn't increase

(a) boiling point

(b) Ability to burn

(c) melting point

(d) viscosity

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(17) Complete burning of 1 mole of ……….. produces 3 mole of CO2, and 4 moles of H2O

(a) C3H8.

(b) C3H4

(c) C2H4

(d) C2H2

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(16) 1 L of gas …… reacts with 5 L of O2 , at STP

(a)CH4  

(b) C2H6

(c) C3H8.  

(d)C4H10

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(15) Burning of 20 cm3 of gas  …… in an excess of O2

At STP produces 60 cm3 of CO2

  1. a) C3H6.

(b) C4H10

(c) C6H12

(d) C6H14

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(14) The gas which causes the decay of the ozone layer is

(a) CH3CH2CH3

(b) CH3CHCI2

(C) CH3OCH3

(D) CF2Cl2

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(13) 2-methyl pentane is considered the isomer of the compound ………….

(a) 2-methyl butane. 

(b) (2,2-dimethyl Butane

(c) 2,2-dimethyl pentane  

(d) 2,2-dimethyl propane

 

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(17) 1,2-dibromoethane is not formed, when hydrogen bromide reacts with ethyne.

why?

 

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(16) Sulphuric acid plays an important role in the addition reaction of water to ethene.

why??

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(15) Bromine dissolved in carbon tetrachloride is not used to differentiate between ethene and ethyne.

why??

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(14) Ethene reacts by addition in one step, whereas Ethyne reacts in two steps.

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(13) Oxyacetylene flame is used in cutting and welding metals.

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(12) Before the collection of ethyne gas prepared by dropping water on calcium carbide, it must be firstly passed over copper sulphate solution in sulphuric acid.

why??

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(11) Alkynes are very active compounds.

Why?

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(10) Ethylene glycol is used as an antifreeze substance in car radiators in cold areas.

Why?

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(9) The violet color of potassium permanganate in alkaline medium is discharged when it reacts with ethene.

Why?

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(8) The hydration reactions of alkenes should proceed in the presence of a strong acid.

Why?

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(7) On adding hydrogen bromide to vinyl bromide, 1,2-dibromoethane is not formed

Why?

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(6) On adding hydrogen bromide to propene, 1-bromopropane is not formed.

Why??

 

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(5) When bromine dissolved in carbon tetrachloride is added to ethene, the red colour of  bromine is discharged.

Why?

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