ABCDEFGHIJKLMNOPQRSTUVWXYZ
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Qns partsQuestionResponse
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e.g. 1ei
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1aiiido i have to write the backward endothermic reaction is favoured first or can i write POE first?
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2biam i legally allowed to write propan-2-ol as C3H8O instead of the whole thingMs Chang: Well, then you might legally get 0 for that portion
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2ciican i use dilute h2so4 instead for the second step?
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2ciiican explain step 3 with the ch3mgbr
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can my G be an alkene and step 1 be ethanolic KOH, heat under reflux?Ms Chang: No, you will not get H
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How do we figure out we should get a ketone for the synthesis of final molecule?
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3ci where is water cmg from in the ans??
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3aican please explain how to derive the dot and cross diagram for NO3-
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3aiihow to get sp2?cus trigonal planar
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3bvhow to get 1/4 (1/2)^2 since reaction first order wrt to solvent me thinks
Ms Chang: ??? Solvent only?
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3ciHow to know acetanilide is neutral? Is it because the lone pair of electrons on N can delocalise into C=O bond so less available for donation?coz amide
Ms Chang: That's right. LP of e on N can delocalise into the C=O bond so less available for protonation
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How do we explain the nature of the respective compounds (if question ask)Ms Chang: I don't understand what you mean, the qns is on comparison of acidity
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4biihow do we know we must continue the reaction to VO2+ and cannot stop at V3+
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4diiiCould you please demonstrate how to derive the molecules? (Especially P)
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5aican i draw half arrows instead of full arrows?Ms Chang: Draw half arrows
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5a iv Can I draw 3D structure without showing dative bonds?
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5dhow come we cannot say X is alkene as it decolourise Br2 aq
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4ivwhy cant we say that the lone pair of electrons are dispersed over the -co group, lowering availaiblity of lone pair to attract one more H+ ion?
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1aiii thought they asked for (fe3+- complex) for the denomiantor? not fe3+ only
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1cRegarding the identification of B, instead of SiO2 (correct ans), I chose Al2O3, can you explain why it is not accepted
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1chow do you derive that the ratio of D precipitated cl- is 1:5?
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4aii
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1aiiI don't ustd the working... why is it that % of Fe3+ = 100 - x?
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1aiiican I say "the mixture will be more yellow" instead of "the red colour will be less intense"?
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