• # question_answer ) (a) Write down resonating structure and tautomer of     (b)$C{{H}_{2}}=\overset{\Theta }{\mathop{C}}\,H$ is more basic than $HC\equiv {{C}^{-}}$. Explain why.

(a)                              (b)$C{{H}_{2}}=\overset{s{{p}^{2}}}{\mathop{C{{H}^{-}}}}\,$   $HC\equiv \overset{sp}{\mathop{{{C}^{-}}}}\,$ Since, $sp$-carbon is more electronegative than $s{{p}^{2}}$-carbon, therefore, $CH\equiv {{C}^{-}}$ is less willing to donate a pair of electrons than ${{H}_{2}}C=C{{H}^{-}}$. In other words, ${{H}_{2}}C=C{{H}^{-}}$ is more basic than $HC\equiv {{C}^{-}}$.