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JEE Advanced levelNumerical answerDifficulty 3 of 3nc258

The compound shown is one of the constitutional isomers of its molecular formula that are amines (stereoisomers not counted). Let x be the number of these isomers giving a positive carbylamine test and y the number giving a neutral N-nitroso compound with cold nitrous acid. Give x + y as an integer.

Numerical answer type, tolerance 0.5.

Answer: 7

The compound shown is butylamine, C4H11N. The amine isomers are 4 primary (butyl, sec-butyl, isobutyl, tert-butyl), 3 secondary (diethyl, methylpropyl, methylisopropyl) and 1 tertiary (dimethylethyl). Only primary amines give carbylamine, so x = 4; only secondary amines give N-nitrosamines, so y = 3. Hence x + y = 7.
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