Given below are two statements :

Statement I : Sulphanilic acid gives esterification test for carboxyl group.

Statement II : Sulphanilic acid gives red colour in Lassigne's test for extra element detection.

In the light of the above statements, choose the most appropriate answer from the options given below :

Compound that will give positive Lassaigne's test for both nitrogen and halogen is :

In base vs. acid titration, at the end point methyl orange is present as