Correct answer is 2. Give reason and show all the steps

Correct answer is 2. Give reason and show all the steps


$$\begin{gathered} M{g}_2{C}_3 +H_{2}O\to \overline{)A}\stackrel{Na}{\to }\overline{)B}\stackrel{C{H}_{3}Br}{\to \overline{)C}:} \\ The incorrect statement for C is \end{gathered}$$

1. Compound $\overline{)C}$ is $C{H}_3-C\equiv C-C{H}_3$

2. $\overline{)C}$ gives positive tollens test.
3.In compund  $\overline{)C}$ all four carbon are linearly present
4. compound  $\overline{)C}$ on ozonolysis gives diketone