Grade 12Physical Chemistry
Explain about Fischer projection formulae andAbsolute and relative configurations
Explain about Fischer projection formulae and
Absolute and relative configurations
2 Answers
SAI SARDAR
Fischer projections provide an easy way to draw three dimensional molecules on paper.all atoms are projected onto one plane.In Fischer projections the formula of number of stereo isomars is 2n .
pralay
Approved Tutor Answer10 Years agoFischer projection formulae :
• To represent three dimentional structures on a two dimentional surface Fischer projection formulae
were proposed.
• In Fischer projection formulae the molecule is oriented in such a way that
(i) The vertical bonds at the stereogenic center are directed away form the viewer horizontal bonds
point towards him.
(ii)If the carbon chain is more than one carbon atom, the chain is written vertically.
(iii)the stereogenic carbon (or) other carbon atoms of the chain are the centre of crosses and
are not shown through symbols but understood.
• To represent three dimentional structures on a two dimentional surface Fischer projection formulae
were proposed.
• In Fischer projection formulae the molecule is oriented in such a way that
(i) The vertical bonds at the stereogenic center are directed away form the viewer horizontal bonds
point towards him.
(ii)If the carbon chain is more than one carbon atom, the chain is written vertically.
(iii)the stereogenic carbon (or) other carbon atoms of the chain are the centre of crosses and
are not shown through symbols but understood.
The three dimentional arrangement of atoms or groups at asymmetric carbon atom is called its
absolute configuration.
• Neither the sign nor the magnitude of rotation by itself provides any information about absolute
configuration of a substance.
absolute configuration.
• Neither the sign nor the magnitude of rotation by itself provides any information about absolute
configuration of a substance.
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