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11.2 Alkanes — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10Chemistry11.2 Alkanes5 Marks
Question
(a) What are products obtained when methane reacts with chlorine in diffused sunlight?
(b) Write the equation when methane reacts with chlorine in diffused sunlight.
(c) Name and define the type of above reaction.
✓

Answer

(a) The products obtained when methane reacts with chlorine in diffused sunlight are Chloromethane, Dichloromethane, Trichloromethane and Tetrachloromethane.
(b)
$CH _4+ CI _2 \xrightarrow[\text { or } \Delta]{\text { UV light }} CH _3 Ci + HCI $
$CH _3 CI + CI _2 \longrightarrow CH _2 CI _2+ HCI $
$CH _2 CI _2+ CI _2-\cdot CHCi _3+ HCI$
$CHCI _3+ Ci _2 \longrightarrow CCI _4+ HCI$
(c) The above reaction is substitution reaction. Here the substitution of alkanes with chlorine takes place hence it is called chlorination.
The reactions in which the hydrogen of the alkane molecule is replaced by another atom or group of atoms resulting in the formation of the derivative of that hydrocarbon are called substitution reactions. Substitution by halogen atom is called halogenations.

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