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Carbon and its Compounds — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceCarbon and its Compounds2 Marks
Question
A compound ‘X’ has molecular formula C4H10. It undergoes substitution reaction readily than addition reaction. It burns with blue flame. It is present in LPG. Identify ‘X’ and give the balanced equation for its combustion and substitution reaction with Cl2 in presence of sunlight.
✓

Answer

X is Butane-C4H10

Butane belongs to Alkanes and undergoes combustion reaction and gives blue non sooty flame.

Combustion reaction:

$\text{C}_4\text{H}_{10}\ +\ 13\text{O}_2\xrightarrow{\ \ \ \ \ \ \ \ \ \ }4\text{CO}_2\ +\ 5\text{H}_2\text{O}\ +\ \text{Energy}$

Butane undergoes substitution reaction with chlorine in presence of sunlight.

$\text{C}_4\text{H}_{10}\ +\ \text{Cl}_2\xrightarrow{\ \ \ \ \ \ \ \ \ }\text{C}_4\text{H}_9\text{Cl}\ +\ \text{HCl}$

$\text{C}_4\text{H}_9\text{Cl}\ +\ \text{Cl}_2\xrightarrow{\ \ \ \ \ \ \ \ \ }\text{C}_4\text{H}_8\text{Cl}_2\ +\ \text{HCl}$

$\text{C}_4\text{H}_8\text{Cl}_2\ +\ \text{Cl}_2\xrightarrow{\ \ \ \ \ \ \ \ \ \ }\text{C}_4\text{H}_7\text{Cl}_3\ +\ \text{HCl}$

Reaction continues till all hydrogen atoms are replaced by Cl.

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