Question

Why is acetylene is more acidic then ethylene?

Answer 1

acetylene has sp hybridisation and ethylene has sp2 hybridisation .so acetylene has more s character.hence bonding electrons are nearer to nucleas.i.e.,the elecronnegativity of carbon is more.hence the bonding electron(c-H acetylene) are moved towards towards carbon.thus we easily remove the H as H+ with base.hence acetylene is somewhat acidic.but due to the less s character in ethylene it does not show acidity