What is hydrogenation ? What are the requirements for hydrogenation to happen , explain with the help of example ?

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$H y d r o g e n a t i o n m e a n s a d d i t i o n o f h y d r o g e n . N o r m a l l y a d d i t i o n o f h y d r o g e n t a k e s p l a c e w i t h u n s a t u r a t e d c o m p o u n d s i n t h e p r s e n c e o f c a t a l y s t l i k e N i o r P t C H_{2} = C H_{2} \overset{H_{2} / N i}{\to} C H_{3} - C H_{3} E t h e n e E t h a n e$

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What is hydrogenation ? What are the requirements for hydrogenation to happen , explain with the help of example ?

Hydrogenation means addition of hydrogen. Normally addition of hydrogen takes place with unsaturated compounds in the prsence of catalyst like Ni or PtCH2=CH2 →H2/ Ni CH3-CH3Ethene Ethane