How many structural isomers of C₃H₆ClBr are possible and how many of them are optically active respectively?

Structural Isomers of C₃H₆ClBr and Their Optical Activity:

• 1-Bromo-1-chloropropane

Structure:

Br
|
CH₂−CH−CH₃
|
Cl

Optically active (The second carbon is chiral).

• 1-Bromo-2-chloropropane

Structure:

Br−CH₂−CH−CH₃
|
Cl

Optically active (The second carbon is chiral).

• 2-Bromo-1-chloropropane

Structure:

Cl−CH₂−CH−CH₃
|
BrBrBr

Optically active (The second carbon is chiral).

• 2-Bromo-2-chloropropane

Structure:

CH₃−C(Br)(Cl)−CH₃

Not optically active (No chiral center).

• 1-Bromo-3-chloropropane

Structure:

Br−CH₂−CH₂−CH₂−Cl

Not optically active (No chiral center).

Summary:

Total structural isomers: 5.

Optically active isomers: 3.

Correct Answer: B. 5, 3