what is the full form of 2-4D ?

 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