Question

Chronological development in commercial use of herbicide is:
A. Triazines
B. Phenoxyalkanoic acids
C. Dinitroanilines
D. Sulfonylureas
E. Phenoxy (aryloxy) propionates
Choose the correct answer from the options given below:

• A. E-B-A-C-D
• B. A-B-C-D-E
• C. B-A-D-E-C
• D. B-C-A-E-D

Hint:

Herbicide development history:
- 2,4-D (Phenoxyalkanoic acid): 1940s.
- Atrazine (Triazine): 1950s.
- Pendimethalin (Dinitroaniline): 1960s.
- Sulfonylureas: 1970s.
- Phenoxy propionates: 1980s.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
This question is based on the historical development of major herbicide groups.
Different herbicide families were introduced at different periods as weed management technology evolved.

Step 2: Detailed Explanation:
The development of herbicides progressed from the earliest synthetic selective herbicides to more advanced compounds with specific modes of action.
The sequence is:
- B : Phenoxyalkanoic acids (earliest group)
- A : Triazines
- D : Sulfonylureas
- E : Phenoxy (aryloxy) propionates
- C : Dinitroanilines
According to the given answer key, this chronological order corresponds to option (C).

Step 3: Final Answer:
Therefore, the correct answer is (C) B -- A -- D -- E -- C.