Functional group in methyl orange

Answer 1

Methyl orange is red under a pH=3,1 and yellow over a pH=4,4; methyl orange is useful for the titrimetric determination of acids concentration.

Answer 2

The functional group in methyl orange is a azo group (-N=N-) which is responsible for its characteristic orange color.

Answer 3

Methyl orange can be used as a dye or a pH indicator.

Answer 4

A diazo group

Answer 5

Methyl orange is a polar compound.