Question

$$\begin{gathered} Moststablecarbanionis \\ \left(1\right)CH\equiv C^{⊝} \\ \left(2\right)H_{2}C=\stackrel{⊝}{C}H \\ \left(3\right)C{H}_3-\stackrel{\stackrel{C{H}_3}{|}}{\underset{\underset{C{H}_3}{|}}{C}}-\stackrel{⊝}{C}{H}_2 \\ \left(4\right)C{H}_3-\stackrel{\stackrel{C{H}_3}{|}}{\underset{\underset{C{H}_3}{|}}{C}}=\stackrel{⊝}{C}H \end{gathered}$$

Answer 1

Dear student
Since the stability of carbanion increases on increasing % S character and decreases on increasing +I effect, hence most stable carbanion is an option (1).Thus the answer is the option (1).
In option (4) the given structure has some mistake.

Regards