Among the given compounds, compound (d) is aromatic, which greatly enhances its stability due to resonance stabilization. Compound (a) is antiaromatic, making it the least stable among the given options.
Compound(b) and compound (c) have sp3 hybridized carbon atoms bearing the negative charge. Based on angle strain theory, compound (c) is more stable than compound (b) due to its ring structure.
The acid formed when propyl magnesium bromide is treated with CO_2 followed by acid hydrolysis is:
The best reagent for converting propanamide into propanamine is: