Question

Which of the following groups of herbicides, dicamba belongs to?

• A. Aryloxy alkanoic acids
• B. Arylcarboxylic acids
• C. Thiocarbamates
• D. Dinitroanilines

Hint:

Recall dicamba's chemical name, a substituted benzoic acid.

Answer 1

The Correct Option is B

Step 1: Understanding the Question.
We need to place dicamba into its correct chemical group among the herbicide classes listed.

Step 2: Key Chemistry.
Dicamba is chemically 3,6 dichloro 2 methoxybenzoic acid. Its parent structure is benzoic acid, an aromatic ring carrying a carboxylic acid group, so benzoic acid type herbicides are grouped under the broader class of arylcarboxylic acids.

Step 3: Ruling Out Other Options.
Aryloxy alkanoic acids, such as 2,4-D and MCPA, carry an aryl group linked through an oxygen to an alkanoic acid chain, a different structure from dicamba. Thiocarbamates, like EPTC, carry a sulfur linked carbamate group and act mainly as growth inhibitors in soil, again a different chemistry. Dinitroanilines, like pendimethalin and trifluralin, carry two nitro groups on a benzene ring and work by blocking cell division, unrelated to dicamba's structure.

Step 4: Final Answer.
Since dicamba is a benzoic acid type compound, it falls under arylcarboxylic acids, so option 2 is correct.