A) \[{{3}^{o}}-\]nitroalkane
B) \[{{2}^{o}}-\]nitroalkane
C) \[{{1}^{o}}-\]nitroalkane
D) all of these
Correct Answer: A
Solution :
Key Idea: Tautomerism arises due to presence of labile hydrogen in organic compounds. The compounds having \[\alpha -\]hydrogen show tautomerism. \[\underset{{{1}^{o}}\,\text{nitroalkane}}{\mathop{R-\underset{H}{\overset{H}{\mathop{\underset{|}{\overset{|\,\alpha }{\mathop{C}}}\,}}}\,-N{{O}_{2}}}}\,\underset{{{2}^{o}}\,-\text{nitroalkane}}{\mathop{R-\underset{H}{\overset{R}{\mathop{\underset{|}{\overset{|\,\alpha }{\mathop{C}}}\,}}}\,-N{{O}_{2}}}}\,\underset{{{3}^{o}}\,-\text{nitroalkane}}{\mathop{R-\underset{R}{\overset{R}{\mathop{\underset{|}{\overset{|\,\alpha }{\mathop{C}}}\,}}}\,-N{{O}_{2}}}}\,\] \[\because \]\[{{3}^{o}}\]nitroalkane does not have any \[\alpha -hydrogen\] atom. \[\because \]\[{{3}^{o}}\]nitroalkane do not show tautomerism
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