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Answer 1

Answer:

COMBUSTION REACTION: burning of hydrocarbons in the presence of oxygen is called combustion reaction

CH4+O2 =CO2 +H2O+ heat +light

1. it is exothermic reaction produce heat
2. saturated hydrocarbons gives blue flame on combustion

• unsaturated hydrocarbons produce sooty yellow flame on combustion
• SUBSTITUTION REACTION : Generally saturated hydrocarbons are involved in this type of reactions.
• replacement of an atom or a group of atoms in hydrocarbons is called substitution reaction
• CH4 +Cl2 =CH3Cl +HCl
• CH3Cl+ Cl2 = CH2Cl2 + HCl
• CH2Cl2 + Cl2 =CHCl3 +HCl
• CHCl3 +Cl2 =CCl4 +HCl
• methane does not involve in addition reactions .because it is saturated hydrocarbon.
• unsaturated hydrocarbons only involved in addition reactions

Explanation:

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