Cha Chapter pter 11
Carb Carbon on Comp Compou ound ndss
Paper 1 Answer all questions. Each question is followed by four options, A , B , C and D. For each question, choose one answer only. 1)
Whic Which h of of the the foll follow owin ing g is is an an uns unsat atur urat ated ed hydr hydroc ocar arbo bon? n? A Alkene C Alcohol B Alkane D Carboxylic acid
2)
An alkane with four carbon atos has the forula A C!"! C C!"# B C!"$ D C!"1%
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'he general forula for alkene is A Cn"2n C Cn"2n ( 2 B C2n"n D Cn"2n ( !
!)
Which of the following is produced when a ixture of propene and hydrogen is channelled oer nickel at a teperature of 1#%oC? A Propanol C Propane B Propanoic acid D Propyl propanoate
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Which of the following is able to undergo an oxidation reaction? I Alkene II Alkane III Alcohol IV Carboxylic acid A + and ++ only C ++ and +++ only B + and +++ only D +, +++ +++ and +- only sterification occurs when A carboxylic acid reacts with alcohol B an alkene is produced fro alcohol through heating C one carbon ato is bonded to an /0" group D one big alkane olecule is broken up into saller alkene olecules Which of the following is a polyer? A ubber C 3lucose B thene D +soprene
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'he cheical e5uation below represents the reaction between butene and broine. 4utene ( 4r 2 8 Y Which of the following is the structural forula for Y ?
A
"
"
"
"
" / C/ C / C /C / " 4r " B
"
"
" "
4r "
" / C/ C / C /C / " " 4r
C
"
"
"
"
4r
"
" / C/ C / C /C / "
D
4r 4r "
"
"
"
"
"
" / C / C / C / C / 4r " "
6)
"
4r
'he figure below shows the structural forula for an ester olecule.
What is the nae of the ester? A 7ethyl ethanoate B Propyl ethanoate
C Propyl ethanoate D 7ethyl propanoate
2
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'he cheical e5uation below shows the conersion of ethene to ethanol. &%% oC, $% atospheric pressure phosphoric acid
C2"! ( "20 C2"*0" What is the nae of the process shown by the e5uation aboe? A 9ehydration C "ydrogenation B "ydration D 0xidation
Paper 2 Answer all the questions. :tructured 5uestion 'he figure below shows a series of changes experienced by an organic substance. Propan<2
+
++
Propene
:ubstance P "2, nickel 1#%oC -
+-
Propanoic acid
Polyer Q 1,2
;a) Write the olecular forula for propan<2
;c)
;d)
;ii) ;i) ;ii)
=ae the reaction that occurs. =ae the reaction in change ++. What is the general forula for the hoologous series of substance P that is fored? ;iii) :ubstance P has a relatie olecular ass of !!. What is the olecular forula for P ? >elatie atoic ass ", 1@ C , 12 >:how how you obtain the answer ;i) =ae the substance that is needed in change +++. ;ii) =ae the reaction in change +++. ;iii) Write the cheical e5uation to represent the reaction that occurs.
;e) 9raw the structural forula for 1,2
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ssay 5uestion 'he figure aboe shows a series of conersions undergone by an organic copound. "ot porcelain pieces
( "2 Alkane X
1#%oC
Pro ene
0xidising agent
Alcohol Y
Propanoic acid
ster Z
;a)
9raw the structural forula for two isoers of propanol. =ae both the isoers.
>! arks ;b) :tate one cheical test that allows you to differentiate between propene and alkane X . xplain the differences in the obserations ade during the cheical test. > arks ;c) :tate two siilarities that are shown by both propene and alkane X . >2 arks ;d) 4oth alcohol Y and ester Z are colourless li5uids. :tate two differences between the alcohol Y and ester Z . >2 arks ;e) ;i) 'he table below shows the result of the laboratory actiity concerning the coagulation of latex. Procedure "ydrochloric acid is added into the latex
Observation Batex coagulates
xplain how hydrochloric acid acts on the latex.
>2 arks
;ii) Batex is re5uired to be aintained in li5uid for in order to be exported out of the country. :uggest one cheical substance that can be added into the latex to aintain it in li5uid for. xplain how the cheical substance reacts. >& arks
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Paper & Answer the question.
'he tyres of ehicles that are ade fro ulcanised rubber are ore elastic. 'his is because the sulphur atos are cross
>:tate the purpose of the experient >:tate all the ariables >:tate the hypothesis >Bist the aterials and apparatus >Choose the procedure >'abulate the data
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Answers Paper 1 1 A 2 9 & A ! C * 4 $ A A # C 6 9 1% 4
Structured question ;a) C&"0" ;b) ;i) Propanol apour is channelled through the heated porcelain pieces ;ii) 9ehydration ;c) ;i) "ydrogenation E addition ;ii) Cn"2n(2 ;iii) 12n ( 2n ( 2 F !! 1! n F !2 nF& 7olecular forula P F C&"# ;d) ;i) Acidified potassiu dichroate;-+) solution E Acidified potassiu anganate;-++) solution ;ii) 0xidation ;iii) C&"0" ( 2>0 8 C 2"*C00" ( " 20 ;d) ;i) 4roine water ;ii) 4roination E Addition ;e) " " "
"/C/C/C/" " 4r 4r ;f) Polypropene E polypropylene ;g) 7aterial :tea@ Condition &%% oC, $% atospheric pressure, phosphoric acid
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Essa question
;a)
"
"
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"/C/C/C /" " " 0" Propan<1
"
"
"/C/C/C /" " 0" " Propan<2
;b) < Add broine water into propene and into alkane X . < Propene decolourises the brown colour of broine water. < 'he brown colour of broine water reains in alkane X . 0r < Add acidified potassiu anganate;-++) solution into propene and into alkane X . < Propene decolourises the purple colour of acidified potassiu anganate;-++) solution. < 'he purple colour of acidified potassiu anganate;-++) solution reains in alkane X . < Propene is an unsaturated hydrocarbon E has a double bond between two carbon atos < 'he addition reaction occurs < Alkane X is a saturated hydrocarbon E does not hae a double bond between two carbon atos < 'he addition reaction does not occur ;c) Similarities! < +nsoluble in water < Cobusts in excess oxygen to produce carbon dioxide and water ;d) Di""erences! < Alcohol Y dissoles in water, while ester Z does not < ster Z sells fruity, while alcohol Y does not ;e)
;i) < "ydrochloric acid has hydrogen ions that are positiely
preenting coagulation
Paper # ;a) Coparing the property of strength of ulcanised rubber and unulcanised rubber ;b) -ariable that is anipulated 'ype of rubber strip that responds longation of the rubber strip that is kept constant Width and thickness of the rubber stripEass of the weight ;c) -ulcanised rubber is stronger than unulcanised rubber ;d) Bist of aterials :trip of unulcanised rubber, strip of ulcanised rubber Bist of apparatus etort stand, weight, ruler, clip ;e) < 'he unulcanised rubber strip is hung using the clip. < 'he initial length of the unulcanised rubber is easured. < A weight of 2% g is hung on the strip of unulcanised rubber. < 'he length of the unulcanised rubber strip is easured and the length of the elongation of the rubber strip is recorded. < 'he experient is repeated using the ulcanised rubber strip.
;f) $pe o" rubber strip Dnulcanised rubber -ulcanised rubber
Elon%ation o" the rubber strip & cm
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