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CBSE Class 10 Science 2017 Delhi Term II Set 3 Paper

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Question : 8 of 10
Marks: +1, -0
The molecular formula of two carbon compound are C4H8\mathrm{C}_4\mathrm{H}_8 and C3H8\mathrm{C}_3\mathrm{H}_8 which one of the two is most likely to show addition reaction ? Justify your answer. Also give the chemical equation to explain the process of addition reaction in case.
Solution:  
(i) C4H8\mathrm{C}_4\mathrm{H}_8 : Butene - alkene( unsaturated hydrocarbon)
(ii) C3H8\mathrm{C}_3\mathrm{H}_8 : propane - alkane (saturated hydrocarbon)
C4H8\mathrm{C}_4\mathrm{H}_8 i.e., butene shows addition reaction as it is unsaturated hydrocarbon
H−C∣H∣H−C∣H∣H−C∣H∣H=C∣H+Cl2→H−C∣H∣H−C∣H∣H−C∣H∣Cl−C∣H∣Cl−H\mathrm{H} - \underset{\underset{\mathrm{H}}{\vert}}{\overset{\overset{\mathrm{H}}{\vert}}{\mathrm{C}}} - \underset{\underset{\mathrm{H}}{\vert}}{\overset{\overset{\mathrm{H}}{\vert}}{\mathrm{C}}} - \underset{\underset{\mathrm{H}}{\vert}}{\overset{\overset{\mathrm{H}}{\vert}}{\mathrm{C}}} = \overset{\overset{\mathrm{H}}{\vert}}{\mathrm{C}} + \mathrm{Cl}_2 \rightarrow \mathrm{H} - \underset{\underset{\mathrm{H}}{\vert}}{\overset{\overset{\mathrm{H}}{\vert}}{\mathrm{C}}} - \underset{\underset{\mathrm{H}}{\vert}}{\overset{\overset{\mathrm{H}}{\vert}}{\mathrm{C}}} - \underset{\underset{\mathrm{Cl}}{\vert}}{\overset{\overset{\mathrm{H}}{\vert}}{\mathrm{C}}} - \underset{\underset{\mathrm{Cl}}{\vert}}{\overset{\overset{\mathrm{H}}{\vert}}{\mathrm{C}}} - \mathrm{H}
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