The synthetic equivalent of given synthon is $\oplus \mathrm{C}=\mathrm{O} \ominus$
(a)t-butyl isocyanide
(b)t-butyl cyanide
(c)t-butyl cyanate
(d)t-butyl isocyanate
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
⁺C=O⁻, a carbon that is both electrophilic and nucleophilic, is a carbon-monoxide/carbonyl-dipole synthon. Isocyanides (t-BuNC) react at carbon with both electrophiles and nucleophiles and hydrolyse to the carbonyl (a).