Competition - post a photo you've taken of nature >>

OCR A Chemistry F324 Rings, Polymers and Analysis Thu 26 Jan 2012

Scroll to see replies

Original post by SmithytheDrummer

Wait, doesn't each carbon in Benzene have 1 hydrogen attached? So each proton has two carbons each with a proton, so the splitting is a triplet?

im sure benzene would have only one singlet because all the protons are equivalent and equal protons don't split each other

Reply 761

ZTSR

Also Acid Hydrolysis,
H20 and HCL right ? :colondollar:

Reply 762

High VOLTAGE

Original post by littlin

im sure benzene would have only one singlet because all the protons are equivalent and equal protons don't split each other

yes ! that explains it thanks !

Reply 763

LifeIsGood

Original post by ZTSR

Also Acid Hydrolysis,
H20 and HCL right ? :colondollar:

Yep

Reply 764

Stevo F

Original post by ZTSR

Also Acid Hydrolysis,
H20 and HCL right ? :colondollar:

any acid catalyst yes, and heat/reflux

Reply 765

LifeIsGood

I'm feeling terrified now :frown:

Reply 766

Dreamweaver

Got a feeling the mechanism for the bromination of cyclohexene may come up. Don't think i've seen it before in one of the new spec papers.

Reply 767

Stevo F

Original post by LifeIsGood

I'm feeling terrified now :frown:

its only 60 marks long, not as bad as F322 :smile:

Reply 768

rogersnm

Original post by Dreamweaver

Got a feeling the mechanism for the bromination of cyclohexene may come up. Don't think i've seen it before in one of the new spec papers.

Isn't that content in the previous unit?

Reply 769

Cath-ay

i feel like im gona be sick again... damn you anxietyy!!!!
ocr, please be nice...

Reply 770

Stevo F

Original post by Dreamweaver

Got a feeling the mechanism for the bromination of cyclohexene may come up. Don't think i've seen it before in one of the new spec papers.

is that just Br-Br being polarised as it approaches a double bond (electron dense area), double bond breaks to form C-Br bond, Br-Br bond breaks heterolytically and the + charge left on the other carbon reacts with the negatively charged bromine thats left over?

Reply 771

mmsalvatore

In last years paper, they had to explain what was happening in the Mechanism and what the curly arrows meant.
Will we have to do the same?

Reply 772

rogersnm

Original post by Stevo F

Yup

Reply 773

Stevo F

Original post by mmsalvatore

In last years paper, they had to explain what was happening in the Mechanism and what the curly arrows meant.
Will we have to do the same?

u have to know that curly arrows represent the movement of a lone pair of electrons

Reply 774

Stevo F

Original post by rogersnm

Yup

hehe nice picture to go with my description :biggrin:

Reply 775

Dreamweaver

Original post by rogersnm

Isn't that content in the previous unit?

Original post by Stevo F

Nope p14 of the textbook.

Spot on Stevo. Remember to show the curly arrow coming from a LP of electrons on the bromine to the carbo cation during the second stage.

Reply 776

Stevo F

btw be careful where you draw the curly arrows come from, theyre not allowed to come from a charge, have to come from a lone pair you've drawn or a bond

Reply 777

LifeIsGood

Do we have to know the monomers of Terylene, Kevlar and Nylon off by heart??

Reply 778

Stevo F

Original post by Dreamweaver

Nope p14 of the textbook.

Spot on Stevo. Remember to show the curly arrow coming from a LP of electrons on the bromine to the carbo cation during the second stage.