Which of the following compounds is most reactive to an aqueous solution of sodium carbonate ?
← JEE Main 2017 · 9 Apr · Shift 1
ChemistrySingle correct+4 / -1Question 52 of 90
JEE Main 2017 · 9 Apr · Shift 1, Chemistry question 52
Answer and worked solution
Official answer: C
Losing a proton from cyclopentadiene gives the aromatic cyclopentadienyl anion (6 π electrons), so it is by far the most acidic of the four hydrocarbons. The key treats it as the one that reacts with sodium carbonate (in practice its pKa of about 16 is still too high for carbonate to deprotonate it fully).