• # question_answer What is the total number of sigma and pi bonds in the following molecules? (a)${{C}_{2}}{{H}_{3}}Cl$                            (b)$C{{H}_{2}}C{{l}_{2}}$ (c)${{H}_{3}}C-\overset{\begin{smallmatrix} H \\ | \end{smallmatrix}}{\mathop{C}}\,=\overset{\begin{smallmatrix} H \\ | \end{smallmatrix}}{\mathop{C}}\,-C\equiv C-H$

(a) is  $H-\overset{\begin{smallmatrix} H \\ | \end{smallmatrix}}{\mathop{C}}\,=\overset{\begin{smallmatrix} H \\ | \end{smallmatrix}}{\mathop{C}}\,-Cl$ (5 $\sigma$bonds, one $\pi$ bond) (b) is  $H-\underset{\begin{smallmatrix} | \\ Cl \end{smallmatrix}}{\overset{\begin{smallmatrix} H \\ | \end{smallmatrix}}{\mathop{C}}}\,-Cl$ (only 4 $\sigma$ bonds) (c) is  $H-\underset{\begin{smallmatrix} | \\ H \end{smallmatrix}}{\overset{\begin{smallmatrix} H \\ | \end{smallmatrix}}{\mathop{C}}}\,-\underset{{}}{\overset{\begin{smallmatrix} H \\ | \end{smallmatrix}}{\mathop{C}}}\,=\underset{{}}{\overset{\begin{smallmatrix} H \\ | \end{smallmatrix}}{\mathop{C}}}\,-C\equiv C-H$( 10 $\sigma$ bonds, $3\pi$ bonds)