question_answer 1)

How many \[\sigma \]and \[\pi \] bonds are present in each of the following molecules? (a)\[HC\equiv CCH=CHC{{H}_{3}}\] (b)\[{{H}_{2}}C=C=CHC{{H}_{3}}\]

Answer:

(a) Number of \[\sigma \] (C - C) bonds = 4; Number of\[\sigma \] (C -H) bonds = 6 Total number of \[\sigma \] bonds = 4 + 6 = 10 No. of \[\pi \](C = C) bonds = 1; No. of \[\pi \] \[(C\equiv C)\] bonds = 2 Total number of \[\pi \] bonds =1+2 = 3 (b) No. of \[\sigma \] (C - C) bonds = 3; No. of \[\sigma \] (C-H) bonds = 6 Total number of \[\sigma \] bonds = 3+6 = 9 No. of \[\pi \](C = C) bonds = 1 x 2 = 2