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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 $C _4 H _{10}$. 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 $Cl _2$ in presence of sunlight.
✓

Answer

X is Butane- $C _4 H _{10}$
Butane belongs to Alkanes and undergoes combustion reaction and gives blue non sooty flame.
Combustion reaction:
$C_4 H_{10}+13 O_2 \longrightarrow 4 CO_2+5 H_2 O+\text { Energy }$
Butane undergoes substitution reaction with chlorine in presence of sunlight.
$C_4 H_{10}+Cl_2 \longrightarrow C_4 H_9 Cl+HCl$
$C_4 H_9 Cl+Cl_2 \longrightarrow C_4 H_8 Cl_2+HCl$
$C_4 H_8 Cl_2+Cl_2 \longrightarrow C_4 H_7 Cl_3+HCl$
Reaction continues till all hydrogen atoms are replaced by Cl .

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