Solution:Concept- Volatility of compounds Camphor is a translucent waxy organic chemical. If left open, it quickly evaporates (converts to a gaseous state). It's a very flammable substance.
Ammonium chloride is an inorganic salt used in the qualitative evaluation of salts. It decomposes quickly into ammonia and hydrochloric acid.
Naphthalene balls are a natural substance that quickly devolves into a vapour state.
(i) Sugar is a carbonyl organic molecule with a sweet flavour. It is non-volatile in nature i.e. It is not immediately transformed to a gaseous state.
(ii) Methyl orange
Turmeric in basic media, it turns red, whereas in an acidic medium, it turns yellow and is a natural indicator.
Rose petal pigments are used as a natural indicator. In an acidic media, it produces a dark red colour, whereas in a basic medium, it produces a reddish green colour.
Beetroot is also a natural indicator and it contains anthocyanin. In an acidic medium, it turns red, while in a basic condition, it turns blue.
Methyl orange is a chemical that has been synthesised. In an acidic medium, it turns red, while in a basic medium, it turns yellow.
Out of all, only methyl orange is a synthetic indicator whether rest are natural indicators.
Thus, methyl orange is the odd one out.
Hence, the correct option is 1.