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  1. periyasamy

    Chemistry: Post your doubts here!

    Guys,I dont really get this question.anyone have a clue?
  2. periyasamy

    Chemistry: Post your doubts here!

    Thank u.:sneaky:
  3. periyasamy

    Chemistry: Post your doubts here!

    U s
  4. periyasamy

    Chemistry: Post your doubts here!

    Need more help here. Thanks a lot guys for always helping.All of u r sure always in my prayers .Lets succeed our goal together. Ans for question 22 is c.
  5. periyasamy

    Chemistry: Post your doubts here!

    u rock man......
  6. periyasamy

    Chemistry: Post your doubts here!

    Yeah boss should be all 3.The sn 2 mechanism is substitution bimolecular whereby bond break and form at same time.So,unlike sn1 it occur at 1 go as both molecules collide at same time n this also causes the formation of 5 bonds(2 partially bond ,one that is going to break and another that is...
  7. periyasamy

    Chemistry: Post your doubts here!

    Guys another question here.Thanks .Ans for this is b.What is meant by the sentence"in which process is a transition element compound used rather than the element itself"
  8. periyasamy

    Chemistry: Post your doubts here!

    I need help for this question .I tried many times but cant get an answer for this.Thanks.Ans is c.
  9. periyasamy

    Chemistry: Post your doubts here!

    For question 25,ans is d.This is because when dehydration occur there is 2 possibilty for the double bond to occur.I think u know this but why option d is selected is try to imagine the structure is rotated 180 degree n it will make sense.It is the same structure but just inverted the other...
  10. periyasamy

    Chemistry: Post your doubts here!

    Thank u,boss. Thanks for always helping.Hope u get awesome results ,surely u deserve it.
  11. periyasamy

    Chemistry: Post your doubts here!

    oops ,sorry boss. A=1,2 AND 3 B=1 AND 2 C=2 AND 3 D =ONLY 1
  12. periyasamy

    Chemistry: Post your doubts here!

    Hai,need help here.Ans is D.
  13. periyasamy

    A level Biology: Post your doubts here!

    welcum;)
  14. periyasamy

    A level Biology: Post your doubts here!

    I dont really get your question.But why ch3 is correct is ecause as u know r group in protein is also known as an alkyl group and ch3 is a methyl,it is an alkyl group.
  15. periyasamy

    A level Biology: Post your doubts here!

    question 18-----answer is a because dna replication occur in interphase(s-phase) question 14----------answer d is wrong because i think enzyme has nothing to do with yield.It only affects rate. question 6------use the formula .....measured length in ruler of given length/the value...
  16. periyasamy

    A level Biology: Post your doubts here!

    Y Yeah ,its A .Thanks agn.
  17. periyasamy

    A level Biology: Post your doubts here!

    Thanks boss.:)
  18. periyasamy

    A level Biology: Post your doubts here!

    what year?
  19. periyasamy

    A level Biology: Post your doubts here!

    question 40 ----option 2 wrong as it is harmfull(eutrophication) --------option 4 is true as it is a fact. Answer is a
  20. periyasamy

    A level Biology: Post your doubts here!

    I can help u some question. Question 14,when doing mean value,avoid anamalous readings question 20-------that is a stage before prophase as chromosome not yet even form questio 22------700*3,why multiply 3 is because highest pssibility when cytosine guanine form 3 hydrogen bond
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