JEE Main levelNumerical answerDifficulty 2 of 3nm133
Using DU=(2C+2+N−H−X)/2, find the degree of unsaturation of 1-nitronaphthalene, CX10HX7NOX2. Give the answer as an integer.
Numerical answer type, tolerance 0.5.
Answer: 8
Here C = 10, H = 7, N = 1, X = 0. DU = (20 + 2 + 1 - 7 - 0)/2 = 16/2 = 8. This corresponds to naphthalene (7: two rings + five C=C) plus one for the N=O of the nitro group.