1. In substitution reaction between bromine and hexane, why the bromine should be in organic solvent? Bromine is already a liquid!
2. Can alkyne undergoes polymerization?
3. What is the relationship between the intermolecular force in PVC and
the stiff and brittle property of PVC?
4. Unsaturated compound can run addition reaction,
they can decolourize halogens, undergo hydrogenation,
and decolourize acidified potassium permangate,
but whether unsaturated compound(other than hydrocarbon)
can have the same experimental result?
F4 Chemistry alkane,alkene
2012-05-20 2:31 am
回答 (2)
2012-05-21 10:23 am
✔ 最佳答案
1：不要太深入，halogenation of alkane一定要用UV light要記，halogen係乜野state反而無乜關事！
2：
能！
3：
PVC中，intermolecular forces of polymer chain 係dipole-dipole；相反大部分其他的addition polymer (例如PE) 係instantaneous dipole-induced-dipole！
dipole-dipole比instantaneous dipole-induced-dipole強。
加Plasticizer可以軟化PVC，所以PVC又是水管，又是保鮮膜！
4：
我不明你問什麼！
2012-05-21 15:58:20 補充：
Unsaturated compound不飽和化合物，表示compound有C=C、C≡C bond。
所以，總體來說，所有C=C及C≡C bond containing compounds可以decolorize bromine (bromine得，bromine water又得)！而所有C=C及C≡C bond containing compounds又可以
decolorize acidified potassium permanganate (MnO4- reduce to Mn2+；MnO4- is purple and Mn2+ is colourless)！
2012-05-21 16:05:25 補充：
有例外的！芳香族化合物 (Aromatic compounds) 係unsaturated compound，例如Benzene and Toluene，但他們不可decolourize bromine，除非有埋FeBr3 or AlCl3 or FeCl3就可以！
芳香族化合物也不可以decolorize acidified potassium permanganate！除非：有benzyl hydrogen同加熱！
當有benzene ring係個structure到要加陪小心，一般不會當C=C甘睇！
2012-05-25 01:48:12 補充：
所以係「C=C及C≡C "bond containing」 compounds。
2012-05-24 9:40 pm
Q.4 不同意.
C=O, C=N 之類的也是unsaturated, 例如ketone, carboxylic acid 之類, 並不能decolorize permanganate / bromine!
C=O, C=N 之類的也是unsaturated, 例如ketone, carboxylic acid 之類, 並不能decolorize permanganate / bromine!
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