1. E1 reaction (in the case of tertiary halides)is much faster than Wurtz reaction
2. Wolff-kishner reaction is carried out at the temperature about 200 C in sealed ampoule.The Huang Minlon modification of Wolff-Kishner reaction allows better yields under atmospheric pressure. Since ethylene glycol (diethylene or triethylene glycols) ater thermally stable and show high boiling points, it is possible to remove water and excess of hydrazine from reaction mixture