Question

Tautomerism will be exhibited by

• A. $(C{H}_3{)}_{2}NH$
• B. $(C{H}_3{)}_{3}CNO$
• C. $R_{3}CN{O}_2$
• D. $RC{H}_{2}N{O}_2$

Answer 1

The correct option is D $RC{H}_{2}N{O}_2$

For a compound to exhibit tautomerism, presence of $\alpha$-hydrogen is neccessary at its $s{p}^3$ hybridised ⍺-C atom. This is satisfied only by $RC{H}_{2}N{O}_2$. Hence it will show tautomerism.
(a,b,c) do not contain acidic $\alpha -hydrogen$ at its $s{p}^3$ hybridised ⍺-C atom and hence it will not show tautomerism.