question_answer 81)

  Which of the following compounds contain all the carbon atoms in the same hybridisation state? (a)\[~H-C=C-C=C-H\]                                     (b) \[C{{H}_{3}}-C\equiv C-C{{H}_{3}}\] (c)\[C{{H}_{2}}=C=C{{H}_{2}}\]                                                  (d) \[C{{H}_{2}}=C=C{{H}_{2}}\]

Answer:

  (a, d)\[H\overset{sp}{\mathop{C}}\,\equiv \overset{sp}{\mathop{C}}\,-\overset{sp}{\mathop{C}}\,\equiv \overset{sp}{\mathop{C}}\,-H\]and \[\overset{s{{p}^{2}}}{\mathop{{{H}_{2}}C}}\,=\overset{s{{p}^{2}}}{\mathop{CH}}\,-\overset{s{{p}^{2}}}{\mathop{CH}}\,=\overset{s{{p}^{2}}}{\mathop{C{{H}_{2}}}}\,\]