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  1. E

    Chemistry: Post your doubts here!

    Yes
  2. E

    Chemistry: Post your doubts here!

    But the proton in OH is directly BONDED to the oxygen, not just next to it. How are we supposed to know that its less shielded than the proton that's just next to it and a benzene ring?
  3. E

    Chemistry: Post your doubts here!

    s17/41 Can someone explain why the OH and CH groups are in their positions? couldn't their shift values be exchanged according to the booklet values? Also I would've guessed the OH group has the higher shift value but the ms is showing the opposite
  4. E

    Chemistry: Post your doubts here!

    Possible products refers to the different products that can be formed based on how oxidised each group gets. These are: Alcohol Aldehyde Alcohol Acid Aldehyde Aldehyde Aldehyde Acid Acid Acid 4 Acids and 4 Aldehydes groups
  5. E

    Mathematics: Post your doubts here!

    You always add C when integrating and solve for it, its just that sometimes C equals zero.
  6. E

    Chemistry: Post your doubts here!

    It's electrophilic addition of bromine across the double bond.
  7. E

    Mathematics: Post your doubts here!

    Yes division is the opposite, you get these from the arg(az) = arg(z) + arg(z) and Re(az) = Re(a)*Re(z) rules. For complex numbers you have to work it out using these rules I think.
  8. E

    Mathematics: Post your doubts here!

    No, I know that multiplying a number by i adds pi/2 to its argument and multiplying it by a real number multiplies its length in the argand diagram
  9. E

    Chemistry: Post your doubts here!

    Fair enough, edited.
  10. E

    Chemistry: Post your doubts here!

    https://www.facebook.com/463818014075291/posts/671605593296531/?sfnsn=mo
  11. E

    Chemistry: Post your doubts here!

    There is three ways to turn an amide to an amine 1) Acid hydrolysis, using HCL(aq) and heat This breaks the amide linkage completely and you end up with two molecules, the amine and the acid. The amine formed will react with the acid to form a salt. 2) Alkaline hydrolysis, using NaOH(aq) and...
  12. E

    Chemistry: Post your doubts here!

    The rate equation depends on the slow step in the mechanism. Here step one is the slow and it needs no Y atoms and two X atoms.
  13. E

    Mathematics: Post your doubts here!

    Assuming you have OD from the second part You can draw a right angle triangle between O, A and the midpoint of OD. Like this: Then the hypotenuses gives you the distance
  14. E

    Mathematics: Post your doubts here!

    I got the same diagram
  15. E

    Mathematics: Post your doubts here!

    Yeah there will be multiple answers for 9(ii)
  16. E

    Mathematics: Post your doubts here!

    Ah, good luck
  17. E

    Mathematics: Post your doubts here!

    A2 , already gave AS. You?
  18. E

    Mathematics: Post your doubts here!

    You have your p3 answers? Mine: 1 (ii)12.2 2 (ii)4^(1/5) 3 (i)tan = (2root2 - 1)/(1 - root6) (ii)128.4, 308.4 6 y = e^(x/2) 7 (a)1 - i and 20/8 + (4/8)i 8 (i)2- 4/(2+x) + 6/(3-2x) (ii)2 + (7/3)x + (7/18)x^2 9 (i)56.9 (ii)(11/7, -5/7 , 0) + lambda(1, -3, -7) 10 (i)8/21 (ii)1.183
  19. E

    Mathematics: Post your doubts here!

    You can make the same sketch on exam paper
  20. E

    Mathematics: Post your doubts here!

    Same except: 3(ii) 135 K has to be smaller than the mean(140) for the probability of being greater than it to be more than 0.5(0.675) 6(ii) 7 Prob(atleast one) = 1 - Prob(none) 1 - 0.65^n > 0.95 solving for n gives me 7
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