Question

Identify chiral structures from the following and choose the correct option:

a) b)c)d)e)f)
g) h) i) j)

A) f, i, g
B) b, a, d
C) e, f, j
D) None of the above

Answer 1

Chirality is a very important concept of stereoisomerism. Chirality refers to mirror images that are non-superimposable. First, we draw the mirror image of the molecule, and then check if it’s superimposable with itself. If it is non-superimposable, we say that the molecule is chiral.

Complete solution:
Chirality is used in stereoisomerism which is a type of isomerism in which organic compounds have the same molecular formula and the same sequence of bonded atoms but differ in $3D$ arrangement of atoms in space. Chirality means mirror images that are non-superimposable. If we say that a molecule is chiral, we mean that the mirror image of that molecule is non-superimposable with itself. To know whether the given molecule is chiral or achiral, we will first draw its mirror image and then check if it's the same or different. If they are the same then the given molecules are chiral.
In the given question, we will check chirality for options $e,f,j$
(e)
Mirror Image for (e):

We can see that the mirror image for (e) is different, hence the structure is chiral
(f)
Mirror Image for (f):

We can see that the mirror image for (f) is different, hence the structure is chiral
(j) ${C_2}{H_5}CHClC{H_3}$

Mirror Image for (j)

We can see that the mirror image for (j) is different, hence the structure is chiral

So the correct option is $C.$

Note: Chirality is a very important concept of stereoisomerism used in biology. This is because large amino acids and sugars are building blocks of large molecules such as proteins, nucleic acids, etc. Chirality is also used in drug chemistry. Chirality has applications in various fields like drugs, optics, etc.