Out of the standard primary and secondary colours, it is only orange that is a fruit aswell?
For example you get apple which is a shade of green but green (nor purple, blue, yellow or red) are actually fruits are they? Just checking for a quiz, it's a simple question but there might be some exotic rare fruit called a blue etc etc . . .
I'm hopefullt going to have a question along the lines of; what is special about the word orange? many people will say 'oh it doesn't rhyme with anything' but it does and the answer will be that it is the only standard primary or secondary colour that is the full name of a fruit aswell, but i'll also accept that it's one of the only english colours that's spelt the same way in french . . .
There are probably a few more, but I said standard, as in red (rouge) yellow (jaune) blue (bleu) purple (?) orange (orange) and green (vert) of which, like I said, only orange is the same.
You could make your question a bit more straightforward by saying "what's so special about the name of an orange?" answer - the only fruit which is known by its colour. The answer you are giving at the moment is going to make people lose the will to live.
BTW - don't upset everyone else, Orange is not an "English colour", it's the same colour in the whole of the English-speaking work. - it's "an adjective in the English language". If any country lays claim to orange as a national colour, it's the Dutch!