what is the full form of 2-4D ?

2, 4-D is 2, 4-dichlorophenoxyacetic acid is a white to crystalline powder used as a herbicide used in the control of broad leaf weeds. It is a hazardous substance.
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2 nd 4-D are 2 different weedicides

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 it means 2,4-dichlorophenoxy acetic acid

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 This highly selective herbicide is toxic to broad leafed plants but less harmful to grasses(1). One of the hormone weedkillers, 2,4-D (2,4-dichlorophenoxy acetic acid) is an aryloxyalkanoic acid known also as a 'phenoxy herbicide', which includes MCPA, mecoprop, triclopyr and 2,4,5-T. These chemicals have complex mechanisms of action against weeds, resembling those of auxins (growth hormones). Once absorbed 2,4-D is translocated within the plant and accumulates at the growing points of roots and shoots where it inhibits growth

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