Physical and Chemical Properties — Prelims Questions

Which of the following reagents will convert 2-butyne into cis-2-butene?

Which of the following compounds will give a red precipitate with ammoniacal cuprous chloride solution?

What is the major product formed when propyne reacts with $H_2O$ in the presence of $HgSO_4$ and dilute $H_2SO_4$?

Which of the following statements about the acidity of terminal alkynes is INCORRECT?

An organic compound (A) with molecular formula $C_4H_6$ reacts with $H_2$ in the presence of Lindlar's catalyst to give (B). (B) on ozonolysis followed by hydrolysis with $Zn/H_2O$ gives only acetaldehyde. Identify (A) and (B).

Which of the following reactions is NOT characteristic of terminal alkynes?