Questions from aqa jun 10 Chem 4- Please help!
I've attached the paper and MS for Jun 10 chem 4 and I was wondering if anyone could help me on some qs.
- Qs 3e (i) & (ii)
- Qs 4b
- 8a
Please could someone explain these to me. Thanks in advance!
- Qs 3e (i) & (ii)
- Qs 4b
- 8a
Please could someone explain these to me. Thanks in advance!
(edited 11 years ago)
8a) Friedal Crafts acylation - electrophilic substituion reaction.
so you know to get electrophile reaction is:
RCOCL + ALCL3 --) RCO3+ + ALCL4-
And so one of the answers is alcl3
and now just look at product given in question to work out what the other is..
as it is benzene--c=0--ch2ch3 thats product given so from that you know ch3ch2c=0cl must have been added.
so overalll reaction to get electrophile:
ch3ch2c=0cl + alcl3 -) ch3ch2c0+ + alcl4-
ch3ch2c0+ is electrophile its used in electrophile substitution which is next q..
so you know to get electrophile reaction is:
RCOCL + ALCL3 --) RCO3+ + ALCL4-
And so one of the answers is alcl3
and now just look at product given in question to work out what the other is..
as it is benzene--c=0--ch2ch3 thats product given so from that you know ch3ch2c=0cl must have been added.
so overalll reaction to get electrophile:
ch3ch2c=0cl + alcl3 -) ch3ch2c0+ + alcl4-
ch3ch2c0+ is electrophile its used in electrophile substitution which is next q..
(edited 11 years ago)
4b im not sure need to revise that again.
3e)
Its primary amine so its gonna be
R-N-H2
And because its carbon nmr focus on carbons.
There are 3 peaks so 3 different carbons in 3 different environments.
So theres ch2 - thats 1 environment
c conected to 2 ch3's is another environment as its all same environment as you cant tell which is which so same enviroment.
and other ch3 is 3rd carbon different enviroment so thats 3rd peak...
so:
NH2--CH2--C(CH3)2--CH3
3bii)
Tertiary amines are like this:
N-R3 connected to 3 r groups.
Theres a doublet so yy=ou know because of n+1 rule there has to be a carbon in there connected to only 1 H.
Also N has to be connected to 3 r groups but if its connected to only 1 carbon then no adjacent hydrogen for that particular carbon so no peak.
So its:
CH3-N-CH3 NO PEAKS GIVEN FROM THIS
AND THEN OTHER PART CONNECTED TO N IS :
CH3-CH-CH3
CH GIVES THE DOUBLET, 3 SETS OF HYDROGENS GIVE 3 PEAKS.
3e)
Its primary amine so its gonna be
R-N-H2
And because its carbon nmr focus on carbons.
There are 3 peaks so 3 different carbons in 3 different environments.
So theres ch2 - thats 1 environment
c conected to 2 ch3's is another environment as its all same environment as you cant tell which is which so same enviroment.
and other ch3 is 3rd carbon different enviroment so thats 3rd peak...
so:
NH2--CH2--C(CH3)2--CH3
3bii)
Tertiary amines are like this:
N-R3 connected to 3 r groups.
Theres a doublet so yy=ou know because of n+1 rule there has to be a carbon in there connected to only 1 H.
Also N has to be connected to 3 r groups but if its connected to only 1 carbon then no adjacent hydrogen for that particular carbon so no peak.
So its:
CH3-N-CH3 NO PEAKS GIVEN FROM THIS
AND THEN OTHER PART CONNECTED TO N IS :
CH3-CH-CH3
CH GIVES THE DOUBLET, 3 SETS OF HYDROGENS GIVE 3 PEAKS.
Quick Reply
Related discussions
- OCR A Level History Non-British period study: All Exams - 22 Jun 2022 [Exam Chat]
- Edexcel GCSE English Language Paper 1 (1EN0 01) - 5th June 2023 [Exam Chat]
- GCSE Exam Discussions 2024
- what was the paper like for chemistry as paper 1 2023 AQA
- Official Year 11 Chat 2023-24
- Inorganic Chemistry (AQA) - A level
- Need Jan 2022 Past papers - Oxford AQA international A level BL05
- Over 500 questions on AQA Bio Unit 4 + Current Spec and old Spec papers + MS!
- Need Jan 2022 Past papers - Oxford AQA international A level CH03/CH04/Ch05
- Is SnapRevise for chemistry worth the cost ?
- How do i revise for my subjects? Please also recommend good resources (A-levels)
- AQA A Level History Paper 2 (options A to T) 7042/2H - 10 Jun 2022 [Exam Chat]
- AS chemistry paper 2 2022 AQ
- Study Buddy
- AQA A Level History Paper 2 (options A to T) 7042/2L - 10 Jun 2022 [Exam Chat]
- summaya’s gcse journey 🎀💪
- Summer UCAT and AS Revision
- About IAL series
- Current Year 11 Official Thread (2022-2023)!
- has anyone made a big academic comeback in a levels ? year 13
Latest
Trending
Last reply 1 week ago
Im confused about this chemistry question, why does it form these productsTrending
Last reply 1 week ago
Im confused about this chemistry question, why does it form these products
