Tautomerism will be exhibited by

Options

A. `(CH_3)_3CNO`
B. `(CH_3)_2NH`
C. `R_3CNO_2`
D. `RCH_2NO_2`

Answer

D

Explanation

Primary and secondary nitroalkanes having at least one `alpha`-H atom exhibit tautomerism:
The nitro-acinitro system is an example of a triad system the equilibrium is almost completely on the left as the nitro form is stabilized by resonance of the nitro group.