Question

Hydrocarbon `X` and `Y` having molecular formulae C3H8 and C3H6 respectively. Both are burnt in different spatula on the Bunsen flame. Indicate the color of the flame produced by `X` and `Y`. Identify `X` and `Y`. Write the structural formulae.

Answer 1

X is propane and Y is Propene.

X will give blue flame and Y will give yellow flame.


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Answer 2

Answer : The color of the flame produced by X and Y are blue and yellow respectively.

X is propane and Y is propene.

The structural formula of X (propane) is, $CH_3-CH_2-CH_3$

The structural formula of Y (propene) is, $CH_3-CH=CH_2$

Explanation :

Sooty flame : Unsaturated carbon compounds do not burn completely and give a flame with unburnt burnt carbon particles. Such a flame has yellow color and It is called sooty flame.  

Non-sooty flame : Saturated carbon compounds burn completely and give a clear blue flame. This is called non-sooty flame.

Saturated hydrocarbon : It is a hydrocarbon that contain only single bonds between carbon atoms. The general formula of saturated hydrocarbon is, $C_nH_{2n+2}$

Unsaturated hydrocarbon : It is a hydrocarbon that contain double and triple bonds between carbon atoms.

The general formula of unsaturated double bond hydrocarbon is, $C_nH_{2n}$

The general formula of unsaturated triple bond hydrocarbon is, $C_nH_{2n-2}$

As per question,

$C_3H_8$ is a saturated hydrocarbon (propane)  that burns completely and give a clear blue flame.

$C_3H_6$ is a unsaturated hydrocarbon (propene)  that do not burns completely and give a yellow flame.