Alkynes of the type RCPCH may be prepared by nucleophilic substitution reactions in which one of the

Question:

Alkynes of the type RCPCH may be prepared by nucleophilic substitution reactions in which one of the starting materials is sodium acetylide
(a) Devise a method for the preparation of CH3CH2C ≡ CH from sodium acetylide and any necessary organic or inorganic reagents.
(b) Given the information that Ka for acetylene (HC ≡ CH) is 10-26 (pKa 26) comment on the scope of this preparative procedure with respect to R in RC ≡ CH. Could you prepare (CH3)2CHC ≡ CH or (CH3)3CC ≡ CH in good yield by this method?