Kjeldahls method cannot be used to estimate nitrogen for which of the following compounds? (a) (...

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Kjeldahls method cannot be used to estimate nitrogen for which of the following compounds?
(a)
(b)
(c) \( \mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{C} \equiv \mathrm{N} \)
(d)
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