Explain addition reaction of hydrogen in alkynes.

1.	Explain addition reaction of hydrogen in alkynes.
Answer» Solution :When alkynes react with hydrogen in presence, of pt, pd or Ni catalyst initially GIVES alkens and then ALKANES. ` underset("alkyne")(R - C EQUIV C ) - H + H_(2) underset( ""Delta" ")overset(" "Ni " ")(rarr) R - CH = underset("Alkene")(CH_(2)) + H_(2) underset(" " Delta" " )overset(" " Ni"")(rarr) R - underset("alkene")(CH_(2)) - CH_(3)`

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