A) \[C{{H}_{3}}-\underset{OH}{\overset{C{{H}_{3}}}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,}}}\,-\underset{OH}{\mathop{\underset{|}{\mathop{CH}}\,}}\,-C{{H}_{2}}OH\]
B) \[\underset{OH}{\mathop{\underset{|}{\mathop{C{{H}_{2}}}}\,}}\,-\underset{OH}{\mathop{\underset{|}{\mathop{CH}}\,}}\,-\underset{OH}{\mathop{\underset{|}{\mathop{C{{H}_{2}}}}\,}}\,\]
C) \[C{{H}_{3}}-\underset{OH}{\mathop{\underset{|}{\mathop{CH}}\,}}\,-\underset{OH}{\mathop{\underset{|}{\mathop{CH}}\,}}\,-\underset{OH}{\mathop{\underset{|}{\mathop{CH}}\,}}\,-C{{H}_{3}}\]
D) None of the above
Correct Answer: C
Solution :
Key Idea: \[{{\text{1}}^{o}}\]carbon atom has only alkyl group attached to it. \[{{2}^{o}}\]carbon atom has 2 alkyl group attached to it. \[{{3}^{o}}\]carbon atom has 3 alkyl group attached to it. [a]\[C{{H}_{3}}-\underset{OH}{\overset{C{{H}_{3}}}{\mathop{\underset{|}{\overset{|{{3}^{o}}}{\mathop{C}}}\,}}}\,-\underset{OH}{\mathop{\underset{|}{\overset{{{2}^{o}}}{\mathop{C}}}\,}}\,H-\overset{{{1}^{o}}}{\mathop{C{{H}_{2}}}}\,OH\] \[\therefore \]it has \[\text{1,}\,\text{2,}\,{{\text{3}}^{\text{o}}}\]hydroxyl groups. [b] \[\underset{{{1}^{o}}}{\mathop{\underset{OH}{\mathop{\underset{|}{\mathop{C{{H}_{2}}}}\,}}\,}}\,-\underset{{{2}^{o}}}{\mathop{\underset{OH}{\mathop{\underset{|}{\mathop{C{{H}_{2}}}}\,}}\,}}\,-\underset{{{1}^{o}}}{\mathop{\underset{OH}{\mathop{\underset{|}{\mathop{C{{H}_{2}}}}\,}}\,}}\,\] \[\therefore \]It has \[{{\text{1}}^{\text{o}}}\]and \[{{2}^{\text{o}}}\]hydroxyl gas. [c] \[C{{H}_{3}}-\underset{OH}{\mathop{\underset{|}{\overset{{{2}^{o}}}{\mathop{CH}}}\,}}\,-\underset{OH}{\mathop{\underset{|}{\overset{{{2}^{o}}}{\mathop{CH}}}\,}}\,-\underset{OH}{\mathop{\underset{|}{\overset{{{2}^{o}}}{\mathop{CH}}}\,}}\,-C{{H}_{3}}\] \[\therefore \]it has all \[{{2}^{o}}\]hydroxyl group.
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