Really don't remember this. I checked through several times so don't see how I could have missed a question but I didnt think there were any on the benzene reactions apart from that friedel crafts question. So worried now. :/

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Reply 1168

InkyOne

Original post by Birterillo

Really don't remember this. I checked through several times so don't see how I could have missed a question but I didnt think there were any on the benzene reactions apart from that friedel crafts question. So worried now. :/

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It looked like this:

http://www.google.co.uk/imgres?q=triphenylmethane+full+structural+formula&start=46&um=1&hl=en&client=safari&rls=en&biw=1919&bih=993&tbm=isch&tbnid=R-508EugetgDZM:&imgrefurl=http://www.parishchemical.com/product_details.pl%3Fid%3D2107&docid=dCi2JiO3zqsuEM&itg=1&imgurl=http://www.parishchemical.com/structures/5527.gif&w=106&h=145&ei=ucLYT8yeOpOx8QPTg-yCAw&zoom=1&iact=hc&vpx=558&vpy=322&dur=2143&hovh=116&hovw=84&tx=84&ty=59&sig=109017478205839960395&page=2&tbnh=116&tbnw=84&ndsp=57&ved=1t:429,r:41,s:46,i:42

The question was along the lines of what reacted with benzene to make the above molecule.
but 90 degrees anticlockwise, i'm sure you didn't miss it, it wasn't one of those randomly placed questions, (this is com in from someone who missed the back page off her physics GCSE!) it was one with a dotted line and there were questions underneath, and it was friedel krafts alkylation :smile:

(edited 11 years ago)

Reply 1169

Princess Kawaii

OP

15

What did people put for the question about ionic solvents made up of large cations and anions why they have low melting points?

Reply 1170

Birterillo

5

Original post by InkyOne

It looked like this:

http://www.google.co.uk/imgres?q=triphenylmethane+full+structural+formula&start=46&um=1&hl=en&client=safari&rls=en&biw=1919&bih=993&tbm=isch&tbnid=R-508EugetgDZM:&imgrefurl=http://www.parishchemical.com/product_details.pl%3Fid%3D2107&docid=dCi2JiO3zqsuEM&itg=1&imgurl=http://www.parishchemical.com/structures/5527.gif&w=106&h=145&ei=ucLYT8yeOpOx8QPTg-yCAw&zoom=1&iact=hc&vpx=558&vpy=322&dur=2143&hovh=116&hovw=84&tx=84&ty=59&sig=109017478205839960395&page=2&tbnh=116&tbnw=84&ndsp=57&ved=1t:429,r:41,s:46,i:42

The question was along the lines of what reacted with benzene to make the above molecule.
but 90 degrees anticlockwise, i'm sure you didn't miss it, it wasn't one of those randomly placed questions, (this is com in from someone who missed the back page off her physics GCSE!) it was one with a dotted line and there were questions underneath, and it was friedel krafts alkylation :smile:

I honestly still don't recognise it haha but my mate said that was the one they asked why it's coloured and benzene is colourless? Is that correct?

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Reply 1171

InkyOne

Original post by Birterillo

I honestly still don't recognise it haha but my mate said that was the one they asked why it's coloured and benzene is colourless? Is that correct?

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Yeah, that was the question below! :smile:

Reply 1172

InkyOne

Original post by Princess Kawaii

What did people put for the question about ionic solvents made up of large cations and anions why they have low melting points?

Lots of shielding due to the large number of electron shells decreased the strength of the electrostatic attractions between ions, so less energy is required to overcome the ionic bonds between ions.

Reply 1173

Birterillo

5

Original post by InkyOne

Yeah, that was the question below! :smile:

Well I remember that one so I haven't missed like a whole double page or anything. Guess I'll never know if I did the question you were talking about but only sounds like a 1 marker is that right?

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Reply 1174

InkyOne

Original post by Birterillo

Well I remember that one so I haven't missed like a whole double page or anything. Guess I'll never know if I did the question you were talking about but only sounds like a 1 marker is that right?

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yeah, it wasn't significant! :smile:

Reply 1175

Obadetona

14

Kinda glad everyone found it hard!

Reply 1176

Alex J

1

this is maleic anhydride

argh i did it all correct but I left a -OH group on one of the carbons.

Reply 1177

I failed badly

Original post by aim28

I put -38, do you know what the right answer was??

I think its -38 and im pretty sure i got -38 and will have put that. Im going to have a look at the paper tomorrow after maths exam so ill soon know. I think ive just made lots of silly mistakes.

Reply 1178

I failed badly

Original post by Alex J

this is maleic anhydride

argh i did it all correct but I left a -OH group on one of the carbons.

This is what i put but i just drew it structurally. I dont think i got the ester one above it correct though. I did the ester above in linear form with 2 ester groups and an alkene group if i remember correctly but i dont know wether it was supposed to be a ring structure. Seems a bit harsh that they should put things like that in when we dont actually learn about them.

Reply 1179

I failed badly

On the 1 mark question where we had to draw a curly arrow on, did the arrow go from the bond to the oxygen, or should we put it from the bond and stright down to the bond between the oxygen and carbon seen as though a c=o bond was formed?

OCR B F335 - Chemistry by Design - 13th June 2012

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