The metals Li, Na, K and Rb and their salts, when introduced into flame, give the following characteristic colour of flame.

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Lilac, red-violet, golden yellow and crimson red respectively

Red-violet, lilac, golden yellow, and crimson red respectively

Crimson red, golden yellow, red-violet, and lilac respectively

Crimson red, golden yellow, lilac, and red-violet respectively

answer is D.

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Detailed Solution

When we give energy to any object, the kinetic energy of the object's particles increases. This means that these particles absorb this energy. When the energy transferred to the particles exceeds a certain amount, the substance catches fire and bursts into flames.
The colour of light emitted by these flames depends on the energy emitted by each electron as it returns to its original state of energy.
Now, different metals and their compounds may show different colours in their flame.
Thus, the flame colours of the given elements, namely Li, Na, K and Rb are reddish-brown, golden-yellow, lilac and red-violet respectively.
Therefore, option D is the correct option.

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