Question

Match herbicides with their first use/testing or synthesis

Herbicide	First synthesis/use/testing
(A) Glyphosate	(I) 1995
(B) 2, 4-D	(II) 1971
(C) Diclosulam	(III) 1958
(D) Atrazine	(IV) 1944

Choose the correct answer from the options given below:

• (A) - (IV), (B) - (III), (C) - (II), (D) - (I)
• (A) - (II), (B) - (IV), (C) - (I), (D) - (III)
• (A) - (II), (B) - (I), (C) - (IV), (D) - (III)
• (A) - (III), (B) - (IV), (C) - (I), (D) - (II)

Hint:

Recall that 2,4-D and atrazine are much older herbicides than glyphosate and diclosulam.

Answer 1

The Correct Option is B

Step 1: Understanding the Question.
We need to match each herbicide with the year it was first synthesised, tested, or used, based on documented herbicide history.

Step 2: Recalling Key Dates.
2,4-D was one of the earliest synthetic herbicides, first synthesised and tested in the mid 1940s, commonly cited as 1944, before its commercial launch a couple of years later. Atrazine, a triazine herbicide, was first synthesised in 1958 and went on to become one of the most widely used corn herbicides. Glyphosate's herbicidal action was found by John Franz in 1970, with field testing following in 1971, years before its commercial sale began in 1974. Diclosulam is a much newer sulfonamide herbicide, first introduced and tested in the mid 1990s, around 1995.

Step 3: Matching Each Pair.
Putting these together: Glyphosate (A) matches 1971 (II), 2,4-D (B) matches 1944 (IV), Diclosulam (C) matches 1995 (I), and Atrazine (D) matches 1958 (III).

Step 4: Final Answer.
This matching, A-II, B-IV, C-I, D-III, corresponds to option 2, so option 2 is correct.