The correct structure of DDT is;

The correct answer is Option (2) → 

Reason:
DDT is p,p′-dichloro-diphenyl-trichloroethane. Its correct structure must satisfy all three key features:

1. Two phenyl rings 

2. Each phenyl ring has a para-chloro (–Cl) substituent 

3. The two rings are connected through an ethane bridge (–CH–CCl₃) 

   • One carbon bears H and two phenyl groups

   • The adjacent carbon bears three Cl atoms (CCl₃)

Only Option 2 shows:

• Para-chloro substitution on both benzene rings

• Correct –CH–CCl₃ linkage

• Correct overall connectivity of DDT