AQA A-LEVEL CHEMISTRY ALCOHOLS
QUESTIONS WITH 100% CORRECT
ANSWERS.
What,is,the,general,formula,of,alcohols?,,,ANS,-CnH2n+1OH
What,does,the,name,end,in?,,,ANS,--ol
What,is,the,prefix,of,OH,group?,,,ANS,-hydroxy-
If,there,are,2,or,more,-OH,groups,then,what,is,used?,,,ANS,-di,tri..
What,are,the,bond,angles,for,all,H-C-H,bonds,and,C-C-O,bonds?,,,ANS,-109.5
What,is,the,bond,angle,in,H-O-C,bond,(bent-line,shape),Explain.,,,ANS,-104.5
2,bond,pairs,of,electrons,and,2,lone,pairs
repelling,to,a,position,of,minimum
repulsion.,Lone,pairs,repel,more,than
bond,pairs,so,the,bond,angle,is
reduced.
Describe,the,volatility,and,boiling,point,in,alcohols,,due,to,their,ability,form,what,type,of,bond,between,al
cohol,molecules?,,,ANS,-Relatively,low,volatility,and
high,boiling,points,due,to,their,ability,to,form
hydrogen,bond,between,alcohol,molecules.
Describe,the,carbon,cation,formations?,,,ANS,-Primary=,1,carbon,attached,to,carbon,adjoining,oxygen
Secondary=,2,carbons,attached,to,carbon,adjoining,oxygen
Tertiary=,3,carbons,attached,to,carbon,adjoining,oxygen
, What,is,the,oxidising,agent,that,causes,alcohols,to,oxidise?,,,ANS,-Potassium,dichromate,K2Cr2O7
Partial,Oxidation,of,Primary,Alcohols:,what,is,the,overall,reaction,between?,Reagent,used?,Conditions?,,,A
NS,-Reaction:,primary,alcohol,->,aldehyde
Reagent:,potassium,dichromate,(VI),solution,and,dilute,sulfuric,acid
Conditions:,(use,a,limited,amount,of,dichromate),warm,gently,and,distil,out,the,aldehyde,as,it,forms:
What,does,the,aldehyde's,name,end,in?,State,the,bonds?,,,ANS,--al,C=O,bond
on,the,first,carbon,of,the
chain.
What,symbol,represents,O,from,the,oxidising,agent?,,,ANS,-[O]
In,the,oxidation,equations,what,do,you,observe?,CH3CH2CH2OH,+,[O],->,CH3CH2CHO,+,H2O
propan-1-ol,propanal,,,ANS,-Observation:the
orange,dichromate,ion
(Cr2O7,2-),reduces,to
the,green,Cr,3+,ion
When,writing,the,formulae,of,aldehydes,in,a,condensed,way,,how,do,write,C,,H,,O,together?,,,ANS,-CHO
In,distillation,,what,is,it,generally,used,as?,,,ANS,-Separation,technique,to,separate
an,organic,product,from,its,reacting,mixture.,In,order,to,maximise,yield,collected,,only,collect,the,distillat
e,at,the,approximate,boiling,point,of,the,desired,aldehyde,and,not,higher.
Explain,where,and,why,the,bulb,of,the,thermometer,should,be,placed?,,,ANS,-
At,the,T,junction,connecting,to,the
condenser,to,measure,the,correct,boiling
point
QUESTIONS WITH 100% CORRECT
ANSWERS.
What,is,the,general,formula,of,alcohols?,,,ANS,-CnH2n+1OH
What,does,the,name,end,in?,,,ANS,--ol
What,is,the,prefix,of,OH,group?,,,ANS,-hydroxy-
If,there,are,2,or,more,-OH,groups,then,what,is,used?,,,ANS,-di,tri..
What,are,the,bond,angles,for,all,H-C-H,bonds,and,C-C-O,bonds?,,,ANS,-109.5
What,is,the,bond,angle,in,H-O-C,bond,(bent-line,shape),Explain.,,,ANS,-104.5
2,bond,pairs,of,electrons,and,2,lone,pairs
repelling,to,a,position,of,minimum
repulsion.,Lone,pairs,repel,more,than
bond,pairs,so,the,bond,angle,is
reduced.
Describe,the,volatility,and,boiling,point,in,alcohols,,due,to,their,ability,form,what,type,of,bond,between,al
cohol,molecules?,,,ANS,-Relatively,low,volatility,and
high,boiling,points,due,to,their,ability,to,form
hydrogen,bond,between,alcohol,molecules.
Describe,the,carbon,cation,formations?,,,ANS,-Primary=,1,carbon,attached,to,carbon,adjoining,oxygen
Secondary=,2,carbons,attached,to,carbon,adjoining,oxygen
Tertiary=,3,carbons,attached,to,carbon,adjoining,oxygen
, What,is,the,oxidising,agent,that,causes,alcohols,to,oxidise?,,,ANS,-Potassium,dichromate,K2Cr2O7
Partial,Oxidation,of,Primary,Alcohols:,what,is,the,overall,reaction,between?,Reagent,used?,Conditions?,,,A
NS,-Reaction:,primary,alcohol,->,aldehyde
Reagent:,potassium,dichromate,(VI),solution,and,dilute,sulfuric,acid
Conditions:,(use,a,limited,amount,of,dichromate),warm,gently,and,distil,out,the,aldehyde,as,it,forms:
What,does,the,aldehyde's,name,end,in?,State,the,bonds?,,,ANS,--al,C=O,bond
on,the,first,carbon,of,the
chain.
What,symbol,represents,O,from,the,oxidising,agent?,,,ANS,-[O]
In,the,oxidation,equations,what,do,you,observe?,CH3CH2CH2OH,+,[O],->,CH3CH2CHO,+,H2O
propan-1-ol,propanal,,,ANS,-Observation:the
orange,dichromate,ion
(Cr2O7,2-),reduces,to
the,green,Cr,3+,ion
When,writing,the,formulae,of,aldehydes,in,a,condensed,way,,how,do,write,C,,H,,O,together?,,,ANS,-CHO
In,distillation,,what,is,it,generally,used,as?,,,ANS,-Separation,technique,to,separate
an,organic,product,from,its,reacting,mixture.,In,order,to,maximise,yield,collected,,only,collect,the,distillat
e,at,the,approximate,boiling,point,of,the,desired,aldehyde,and,not,higher.
Explain,where,and,why,the,bulb,of,the,thermometer,should,be,placed?,,,ANS,-
At,the,T,junction,connecting,to,the
condenser,to,measure,the,correct,boiling
point
