AQA A LEVEL CHEMISTRY ALDEHYDES
AND KETONES QUESTIONS WITH
ANSWERS 2025 - 2026
What,is,a,carbonyl,group?,,,ANS,-C=O
What,type,of,bond,is,C=O?,,,ANS,-Polar
What,are,the,effects,of,the,carbonyl,group,being,planar?,,,ANS,-
There,is,no,steric,hindrance,,so,the,bond,can,be,attacked,from,any,angle
Why,do,nucleophiles,attack,carbonyl,groups?,,,ANS,-The,carbon,is,slightly,positive
How,do,you,turn,a,primary,alcohol,into,an,aldehyde?,,,ANS,-Oxidise,it
How,to,you,turn,a,carboxylic,acid,into,an,aldehyde?,,,ANS,-Reduce,it
What,is,the,main,reaction,involving,nucleophiles,which,occurs,with,carbonyl,groups?,,,ANS,-
Nucleophilic,addition
What,2,chemicals,can,be,used,as,reducing,agents,for,aldehydes,and,ketones?,,,ANS,-
1.,Lithium,Aluminium,Hydride,(LiAlH4)
2.,Sodium,Borohydride,(NaBH4)
What,is,the,only,situation,in,which,NaBH4,decomposes?,,,ANS,-In,acidic,conditions
How,is,LiAlH4,prepared?,,,ANS,-As,a,solution,in,dry,ether
What,reduction,of,ions,occurs,when,you,use,potassium,dichromate,to,oxidise,alcohols/aldehydes?,,,ANS,-
Orange,Cr,+6,ions,are,reduced,to,green,Cr,3+,ions
AND KETONES QUESTIONS WITH
ANSWERS 2025 - 2026
What,is,a,carbonyl,group?,,,ANS,-C=O
What,type,of,bond,is,C=O?,,,ANS,-Polar
What,are,the,effects,of,the,carbonyl,group,being,planar?,,,ANS,-
There,is,no,steric,hindrance,,so,the,bond,can,be,attacked,from,any,angle
Why,do,nucleophiles,attack,carbonyl,groups?,,,ANS,-The,carbon,is,slightly,positive
How,do,you,turn,a,primary,alcohol,into,an,aldehyde?,,,ANS,-Oxidise,it
How,to,you,turn,a,carboxylic,acid,into,an,aldehyde?,,,ANS,-Reduce,it
What,is,the,main,reaction,involving,nucleophiles,which,occurs,with,carbonyl,groups?,,,ANS,-
Nucleophilic,addition
What,2,chemicals,can,be,used,as,reducing,agents,for,aldehydes,and,ketones?,,,ANS,-
1.,Lithium,Aluminium,Hydride,(LiAlH4)
2.,Sodium,Borohydride,(NaBH4)
What,is,the,only,situation,in,which,NaBH4,decomposes?,,,ANS,-In,acidic,conditions
How,is,LiAlH4,prepared?,,,ANS,-As,a,solution,in,dry,ether
What,reduction,of,ions,occurs,when,you,use,potassium,dichromate,to,oxidise,alcohols/aldehydes?,,,ANS,-
Orange,Cr,+6,ions,are,reduced,to,green,Cr,3+,ions
