On the basis of the following information identify the substances which give flame on burning :

Substance	State	Vapourises on burning
A	Solid	No
B	Liquid	Yes
C	Solid	Yes
D	Liquid	No

The correct option is B and C.

Explanation:

A flame is produced during burning (combustion) only when the substance vapourises while burning.

Let's analyze the given substances based on their tendency to vapourise on burning:

1. Substance A: Does not vapourise on burning ("No"). Therefore, it will not give a flame.

2. Substance B: Vapourises on burning ("Yes"). Therefore, it will give a flame.

3. Substance C: Vapourises on burning ("Yes"). Therefore, it will give a flame.

4. Substance D: Does not vapourise on burning ("No"). Therefore, it will not give a flame.

Thus, the substances that give a flame on burning are B and C.