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JEE Main levelNumerical answerDifficulty 2 of 3nm133

Using , find the degree of unsaturation of 1-nitronaphthalene, . 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.
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