Give a chemical equation for the following reactions. Also state the type of reaction in each case.
Reaction of chlorine with methane in the presence of sunlight.

Conversion of ethene into alkane by hydrogenation

Burning of coal / methane in air.

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Solution

$1 . R e a c t i o n o f C h l o r i n e w i t h m e t h a n e i n t h e p r e s e n c e o f s u n l i g h t C H_{4} + C l_{2} \overset{h ν}{\to} C H_{3} C l + H C l T h i s r e a c t i o n i s a s u b s t i t u t i o n r e a c t i o n a s o n e o f t h e h y d r o g e n i s r e p l a c e d b y c h l o r i n e . 2 . C o n v e r s i o n o f e t h e n e i n t o e t h a n e b y h y d r o g e n a t i o n . C H_{2} = C H_{2} + H_{2} \to C H_{3} - C H_{3} T h i s r e a c t i o n i s c a l l e d h y d r o g e n a t i o n o r r e d u c t i o n a s h y d r o g e n i s a d d e d . 3 . B u r n i n g o f m e t h a n e i n a i r . C H_{4} + 2 O_{2} \to C O_{2} + 2 H_{2} O T h i s r e a c t i o n i s c a l l e d c o m b u s t i o n a s c a r b o n d i o x i d e a n d w a t e r a r e f o r m e d o n b u r n i n g a h y d r o c a r b o n .$

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Methane reacts with chlorine In the presence of sunlight is $C H_{4} + C l_{2} s u n l i g h t - ---- \to C H_{3} C l + H C l$ ,

The name of this reaction is:

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