where Ph is a phenyl ring. There are several definitions of acid. An Arrhenius acid as well as a Brönsted acid is a hydrogen ion donor. There is no hydrogen in diphenylacetylene to donate. A Lewis acid is an electron pair acceptor. Diphenylacetylene can't do that. Diphenylacetylene is a Brönsted and Lewis base in that it will accept a proton. Thus Diphenylacetylene will react with hydrochloric acid. In the first step the hydrogen ion from the hydrochloric acid bonds to one of the pairs of electrons in the triple bond. So, diphenylacetylene is a base and not an acid.
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No. Diphenylacetylene is:
Ph≡C≡Ph
where Ph is a phenyl ring. There are several definitions of acid. An Arrhenius acid as well as a Brönsted acid is a hydrogen ion donor. There is no hydrogen in diphenylacetylene to donate. A Lewis acid is an electron pair acceptor. Diphenylacetylene can't do that. Diphenylacetylene is a Brönsted and Lewis base in that it will accept a proton. Thus Diphenylacetylene will react with hydrochloric acid. In the first step the hydrogen ion from the hydrochloric acid bonds to one of the pairs of electrons in the triple bond. So, diphenylacetylene is a base and not an acid.
no there are no ionisable H+ in the structure...
http://en.wikipedia.org/wiki/Diphenylacetylene
H+ from phenyl cant be ionised as it is aromatic and removing H+ will disrupt aromaticity