Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
The molecules that have non-zero dipole moment, are (1) trans-2-butene (2) trans-2-pentene (3) 2, 2, 3, 3-tetramethyl butane (4) cis-3-hexeneA) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: C
Solution :
Dipole moment is zero for symmetrical molecule. Tran5-2-pentene and cis-3-hexene, being unsymmetric, have some dipole moment. \[\underset{\begin{smallmatrix} \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\mu \ne 0 \\ trans-2-pentene \end{smallmatrix}}{\mathop{{{H}_{3}}C-{{H}_{2}}C-\underset{\begin{smallmatrix} | \\ H \end{smallmatrix}}{\mathop{C}}\,=\overset{\begin{smallmatrix} H \\ | \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{3}}}}\,\] \[\underset{\begin{smallmatrix} \,\,\,\,\,\,\,\,\,\mu \ne 0 \\ cis-3-hexene \end{smallmatrix}}{\mathop{C{{H}_{3}}C{{H}_{2}}\overset{\begin{smallmatrix} H \\ | \end{smallmatrix}}{\mathop{C}}\,=\overset{\begin{smallmatrix} H \\ | \end{smallmatrix}}{\mathop{C}}\,C{{H}_{2}}C{{H}_{3}}}}\,\]
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