JEE Advanced levelNumerical answerDifficulty 3 of 3si247
The ester shown is hydrolysed completely with hot aqueous NaOH and then acidified. Count the 1H NMR signals of the two organic products separately and add them (acid O-H and alcohol O-H each count as a signal). Give the total as an integer. Chemically equivalent hydrogens give one signal; ignore coupling and axial/equatorial differences.
Numerical answer type, tolerance 0.5.
Answer: 7
Ethyl benzoate gives benzoic acid and ethanol. Benzoic acid: COOH and three aromatic sets (ortho, meta, para), 4 signals. Ethanol: CHX3, CHX2, OH, 3 signals. Total 4+3=7.