Saturday, September 30, 2017

organic chemistry - What is metamerism



According to metamerism in polyvalent functional groups, if both alkyl groups' around functional group are different then they are considered as metamers but in few books it is given that if one of the alkyl group is different then it is a metamer.


In my opinion, for e.g. diethyl ether and methyl propyl ether are metamers. But methyl propyl ether and methyl isopropyl ether should be position isomers and not metamers.


Which is true?




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periodic trends - Comparing radii in lithium, beryllium, magnesium, aluminium and sodium ions

Apparently the of last four, $\ce{Mg^2+}$ is closest in radius to $\ce{Li+}$. Is this true, and if so, why would a whole larger shell ($\ce{...