question_answer

                Name the type of hybridisation of each C-atom in a molecule of (i) propylene (propene) (ii) propyne. How many \[\sigma \] and \[\pi \]-bonds are present in each case?

Answer:

                (i) \[\overset{1}{\mathop{C}}\,{{H}_{3}}-\overset{2}{\mathop{C}}\,H=\overset{3}{\mathop{C}}\,{{H}_{2}}(C-1\,\,is\,s{{p}^{3}},\,C-2\,and\]\[C-3\,\,are\,s{{p}^{2}})\],\[\sigma \]- bonds \[=8,\,\,\pi \]-bonds = 1. (ii)\[\overset{1}{\mathop{C}}\,{{H}_{3}}-\overset{2}{\mathop{C}}\,H\equiv \overset{3}{\mathop{C}}\,H\]\[(C-1\,\text{is}\,s{{p}^{3}},\,C-2\,\text{and}\]\[C-3\,\text{are}\,sp),\] \[\sigma \]- bonds = 6, \[\pi \]-bonds = 2.