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:
Which of the following molecules contain (s) only primary hydrogen atoms? (1) Neo-pentane (2) Neo-hexane (3) 2, 2, 3, 3-tetramethylbutane (4) 2, 2, 3-trimethylpentaneA) 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: D
Solution :
The hydrogen that is attached with the primary carbon\[(1{}^\circ )\]is called primary hydrogen. 1. \[\underset{\begin{smallmatrix} neo-pentane \\ (all\text{ }H-atoms \\ are\text{ }primary) \end{smallmatrix}}{\mathop{{{H}_{3}}\overset{{{1}^{o}}}{\mathop{C}}\,-\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \\ \,\,{{1}^{o}} \end{smallmatrix}}{\overset{\begin{smallmatrix} {{1}^{o}} \\ C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{C}}}\,-\overset{{{1}^{o}}}{\mathop{C}}\,{{H}_{3}}}}\,\] 2. \[\overset{{{1}^{o}}}{\mathop{C}}\,{{H}_{3}}-\underset{\begin{smallmatrix} \,\,\,\,\,\,neo-hexane \\ (It\text{ }contains\text{ }1{}^\circ \text{ }as\text{ }well \\ as\text{ }2{}^\circ \text{ }H-atoms) \end{smallmatrix}}{\mathop{\overset{{{2}^{o}}}{\mathop{C}}\,{{H}_{3}}-\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \\ \,\,{{1}^{o}} \end{smallmatrix}}{\overset{\begin{smallmatrix} {{1}^{o}} \\ C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{C}}}\,-\overset{{{1}^{o}}}{\mathop{C}}\,{{H}_{3}}}}\,\] (3) \[\underset{\begin{smallmatrix} 2,\text{ }2,\text{ }3,\text{ }3-tetramethylbutane \\ \,\,\,\,\,(all\text{ }H-atoms\text{ }are\text{ }1{}^\circ ) \end{smallmatrix}}{\mathop{{{H}_{3}}\overset{{{1}^{o}}}{\mathop{C}}\,-\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \\ \,\,{{1}^{o}} \end{smallmatrix}}{\overset{\begin{smallmatrix} {{1}^{o}} \\ C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{C}}}\,-\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \\ \,\,{{1}^{o}} \end{smallmatrix}}{\overset{\begin{smallmatrix} {{1}^{o}} \\ C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{C}}}\,-\overset{{{1}^{o}}}{\mathop{C}}\,{{H}_{3}}}}\,\] (4) \[\underset{\begin{smallmatrix} \,\,\,\,\,\,\,\,\,\,\,2,\text{ }2,\text{ }3-trimethylpentane \\ (It\text{ }contains\text{ }1{}^\circ ,\text{ }2{}^\circ ,\text{ }3{}^\circ \text{ }H-atoms) \end{smallmatrix}}{\mathop{\overset{{{1}^{o}}}{\mathop{C}}\,{{H}_{3}}-\underset{\begin{smallmatrix} | \\ C{{H}_{3}} \\ \,\,{{1}^{o}} \end{smallmatrix}}{\overset{\begin{smallmatrix} {{1}^{o}} \\ C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{C}}}\,-\underset{{}}{\overset{\begin{smallmatrix} {{1}^{o}} \\ C{{H}_{3}} \\ | \end{smallmatrix}}{\mathop{C}}}\,-\underset{{{2}^{o}}}{\mathop{C}}\,{{H}_{2}}-\overset{{{1}^{o}}}{\mathop{C}}\,{{H}_{3}}}}\,\]
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