Question

1 Answer all parts (a)- (e) (a) Give definitions for the terms "isomer" and "conformer. (b) Draw the Newman projections for two conformers of ethane (c) Draw the five isomers of hexane, with the molecular formula CeH14 (do not include different conformers) (d) Some molecules possess a property called "chirality". What structural characteristics need to be met for a molecule to be classed as "chiral"? (e) Amino acids, cysteine (A) and phenylalanine (B) are shown below. )Draw A and B, identifying the chiral centre in each; ii) Use the Cahn-lngold-Prelog nomenclature to assign the configuration of the chiral centres. (3 to IESS CI NH2 NH2

Answer 1

a) isomer: isomers having same molecular formula but different arrangement of atoms in molecule and different properties.

Conformer: conformer is also an isomer of molecule. This conformer is differ from another conformer by the single bond rotation in molecule.

Chirality: The molecule which is non super imposable on its mirror image is called as chiral.

The carbon atom which is attached to 4 different groups are atoms is called as chiral center.

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