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Question
Define racemic mixture.
Give IUPAC name of CH3−CH2−CH3|CH−CHO.
Give IUPAC name of CH3−CH2−CH3|CH−CHO.
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Solution
Racemic mixture:
When equimolar quantities of dextro and laevo
isomers are mixed, the resulting mixture is found to be optically
inactive due to external compensation. Such an optically inactive
mixture is known as racemate or racemic mixture. For example, when we
mix 1 mole of d−tartaricacid with 1 mole of
l−tartaricacid, the resulting mixture is optically
inactive and is called racemic mixture.
The IUPAC name of
CH3−CH2−CH3|CH−CHO is
2-methylbutanal. The parent chain contains 4 C atoms including aldehyde
group. Hence, it is named butanal. The numbering is started so that the
aldehyde C gets number 1. A methyl group is present as substituent on
second C atom.
When equimolar quantities of dextro and laevo isomers are mixed, the resulting mixture is found to be optically inactive due to external compensation. Such an optically inactive mixture is known as racemate or racemic mixture. For example, when we mix 1 mole of d−tartaricacid with 1 mole of l−tartaricacid, the resulting mixture is optically inactive and is called racemic mixture.
The IUPAC name of CH3−CH2−CH3|CH−CHO is 2-methylbutanal. The parent chain contains 4 C atoms including aldehyde group. Hence, it is named butanal. The numbering is started so that the aldehyde C gets number 1. A methyl group is present as substituent on second C atom.
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