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)\[{{H}_{3}}C-\overset{\begin{smallmatrix}  H \\  | \end{smallmatrix}}{\mathop{C}}\,=\overset{\begin{smallmatrix}  H \\  | \end{smallmatrix}}{\mathop{C}}\,-C\equiv C-H\]

Answer:

                (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)