Organic Chemistry Self Check

8/9/2019 Organic Chemistry Self Check

1/11

Anglo-Chinese School(Barker Road)A Methodist lnstitution

Founded in 1886

Structured Questions f30 Markl

CHEMISTRYDEPARTMENT OF SCIENCEName: ( Class: SEC 4

l3a1. List the seven fractions of crude oil in order of decreasing boiling points, and suggest onecommon use for each fraction. t6l

fraction use

2. (a) Define the term 'cracking', t1l

(b) State the conditions necessary for catalytic cracking. l1l

(c) Explain the significance of cracking to the petroleum industry. 121


2/11

tll. (a) What is a'homologous series'?

(b) What is a'functional grouP'? t1l

Apart from having the same function group, list the trends that occur as we movedown a homologous series. t6l(c)1

2.3.A

6.7.

Complete the table below. l4J:ilild iila,rr,.; , SgtieS', .,:; alkenes,,,,,mnc iohal

.,,:,, $rou[,,,,,,, ,,, , none-cooH

$nefal',..foiiirUlS,:::,,, CnH2n..10H

methane


3/11

5. Draw the full structural formula of(a) propanoic acid

(b) ethanol

(c) butene

6. (a) Define the term'isomers'.

t3l

t1l

(b) Draw the full structural formulae of all the possible isomers of CzH+Clz. lZl

(c) Draw the full structural formulae of all the possible isomers of CsHr+. tzl

END


4/11

Anglo-Chinese School(Barker Road)A Methodist Institution

Founded in 1886

CHEMISTRYDEPARTMENT OF SCIENCEName: ( ) Class: SEC 4

Structured Questions I30 Marksl1. (a) Define the term'addition reaction'.

130l1l

(b) Explain what is meant by the term'saturated'. t1l

Explain what is meant by the term'polyunsaturated'.

Describe a chemical test to show that an unknown organic compound is saturated,stating your predicted obseruations. tzl

Describe a chemical test to show that an unknown organic compound is unsaturated,stating your predicted obseruations. tzl

Z. Margarine, which is believed to be a healthier option to the traditional butter, is manufacturedby means of an addition reaction.(a) Name the addition reaction used in the manufacture of margarine. t1l

t1lc)

(d)

t/a\

(b) What is the starting material to which this addition reaction is performed? t1l(c) Explain the purpose of this addition reaction in the manufacture of margarine. tzl


5/11

(a). Comptete the table below which describes the three reactions of alkanes. If there isno other reaction or no special conditions, you may fill in "N/A". t3]

Complete the table below which describes four addition reactions of alkenes' Ifthere is no other reaction or no special conditions, you may fill in "N/A", 14]iei*ion CondiUoni PjodnbE

alkanes

hydration

aqueous bromine

high pressure

Describe how the percentage composition by mass of carbon varies as we move down(a) the alkane homologous series, t1l

(b)

4.

Reactio-n Other Reactants Conditions i.PiodU

combustion

450 "CSiO2 catalyst

chlorine

(b) the alkene homologous series. f 1'lL'J


6/11

The monomers of two addition polymerisation reactions are shown below. For each of thefollowing monomers, draw the full structural formulae of the corresponding polymer, showingtwo repeating units. l?l

The products of two addition polymerisaUon reactions are shown below. For each of thepolymers, draw the full structural formulae of one repeating unit and the full structuralformulae of the monomer. t4l

H\H H .C-Htr/H-C-C- Ctl\HHFT J-I'-+-( TF /c-?-Ht-f-t o

H

:1 r.:r..::;:r::::rr rrji.r:.i;,r:.:i.j!..f;.:.... i.i4ir j, fj.n..",,., ,,;.q.1-:.1'ii r. :l :,.j'lii.iiii.i.!i1iX,:li iri:',,'r,,,0$lYH#.1,,..,,;;i,;',;'f:'.J ,'1r'": iiid"ii:q#F-ffffi,ffii'+ .,'::;;iilI:;iiii:i:i';: ii;;;,i;r;i:;::i,;;li:.; ::,.': :: . :::' :ii,:;ii:::.i,:1;;i1:i;i;j,' r, :lllOlf o$er,,-i. i i,1,i,.i;

FCIFCIFCItttrtl.._c_c_ttllllFHFHFH

9H' T 9H' T 9H, TttllllH C2Hs H C2Hs H QH,


7/11

7. Draw the full structural formulae for the organic molecule remaining when t4l(a) one molecule of methane is fully substituted by two molecules of chlorine,

(b) a molecule of but-l-ene is shaken with liquid bromine,

(.j CH3CH(Cru)CHCHz is heited in the presense of hydrogen and a catalyst,

(d) ethene undergoes an addition reaction with HzO'

END


8/11

l:iffiffi1,wAnglo-Chinese School(Barker Road)A Methodist lnstitution

Founded in 1886

CIIEMISTRYDEPARTMENT OF S CIENCEName: Class: SEC 4

Structured Ouestions [30 Marks]1. (a) State four uses of ethanol.

130l2l

2.

1.2.t

A

(b) In the table below, describe two ways in which ethanol may be produced by namingthe process, stating the starting reagents and describing the conditions. l2lName of Pbcess Ractants Conditions

Construct chemical equations for(a) the combustion of butanol in excess air, tll(b) the reaction between methanoic acid and sodium hydroxide, l1l

(c) the reaction between propanoic acid and calcium metal, t1l

(d) the reaction between ethanol and ethanoic acid, til(e) the combustion of methanoic acid in excess air' l1l


9/11

3. Below shows the structure of three alcohols, each with the molecular formula QHroO.H

IH-C-H.H I r-rttlH-C-C-C-HttlHOHIH

isomer A

HIHOHHttltH-C-C:C-C-HtlllHHHH

isomer B

HH-C-HH I .HrllH-C-C-C-O-HttlHHHisomer C

(a) Which of the above three isomers can be conveded into a carboxylic acid? t1l(b) Name the process in which an alcohol is convefted into a carboxylic acid. t1l(c) State the reactants and conditions necessary for (b).

(d) Draw the full structural formula for the carboxylic acid when the molecule in (a) isreacted to form a carboxylic acid. t1l

(e) Apart from isomers A, B and C, draw the full structural formulae of another alcoholwhich has the molecular formular C.+HroO. t1l

When reacting with concentrated sulfuric acid, isomer B can produce two difterent

t1l

/ (r)\_-_.,-- organic products. Draw the full structural formulae of both products. t1l


10/11

4. Propyl butanoate is an example of an ester.(a) Describe the two key differences between the physical properties of an ester and thatof a carboxylic acid. t1l

(b) Briefly outline how an ester can be formed in a laboratory.

(c) Suggest how you would separate the ester formed in (a) from the reactants. I1l(d) From the molecular formulae below, name the esters.(i) cHscooczHs(ii) csHzcoocgHz(iii) Hcooc4He

Draw the full structural formulae of the esters named below.(i) propyl methanoate

(ii) methylethanote

(f) State three uses of esters.

t1l

t3l

(e)t1l

t1l

I.2.3.

t1l


11/11

5. (a) Define'polymer'. t1l(b) Define'condensation polymerisation'' t1l

.,+iA.Eff..:.:.:,P,o$mt,,,.,

polyester

polyamide

(c) List an example each of a synthetic polyester and synthetic polyamide, and outlinethe structure of each. L2l

The structure of a polymer is shown below. Draw the full structural formulae of themonomer(s) used to form this polymer. t1lMono#er(!i

fn' ? tH, ?..-c-c-llTWo monomers, as shown below, are used to form a macromolecule. Draw the fullstructural formulae of the polymer formed. tll

.M6fiOrners PnltmeiHH\/C:C/\H-O-C. ,C-O-H\\ //oo

H9H\ll/N-C-N/\NN

(d)

(e)

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Organic Chemistry Self Check