Question

non sooty flame will be expected from. 1.C4H6. 2 C6H6 3, C5H10. 4. C4H10​

Answer 1

1,3,4 Will give non sooty Flame because they are alliphatic compound while 2 will give sooty because it is aromatic

Answer 2

Answer : The correct option is, (4) $C_4H_{10}$

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, $C_nH_{2n-2}$

In the given options,

$C_4H_{10}$ is a saturated hydrocarbon

$C_4H_6$ is a unsaturated hydrocarbon

$C_5H_{10}$ is a unsaturated hydrocarbon

$C_6H_6$ is a cyclic unsaturated hydrocarbon

Hence, the non sooty flame will be expected from $C_4H_{10}$.