Which of the following molecules are chiral? (Hint: Draw...

Which of the following molecules are chiral? (Hint: Draw each molecule and analyze it as illustrated in Worked Example $14.2 .$.)
(a) 3-Chloropentane
(b) 2-Chloropentane
(c) $\mathrm{CH}_{3} \mathrm{CHCH}_{2} \mathrm{CHCH}_{2} \mathrm{CH}_{3}$

Key Concepts

Chiral Centers (Stereocenters)

A chiral center, typically a carbon atom, is bonded to four different substituents. The presence of such an atom makes it possible for a molecule to exist in two non-superimposable mirror image forms. Identifying these centers by carefully drawing the molecule and analyzing the substituents is a key step in determining whether a compound is chiral.

Molecular Symmetry

Analyzing molecular symmetry involves looking for elements like mirror planes, centers of inversion, or axes of symmetry within the molecule. A molecule that possesses any of these symmetry elements may be superimposable on its mirror image, thus making it achiral. Drawing out the molecule and visualizing these symmetry elements is essential when determining chirality.

Chirality

Chirality is a property of a molecule in which it is not superimposable on its mirror image. This characteristic is due to the lack of an internal plane or center of symmetry and is central to understanding stereochemistry, as chiral molecules can exist as pairs of enantiomers that often have different chemical and biological properties.

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