MolSynapsequestion bank

MolSynapse / Question bank / Structural Identification and Practical Organic Chemistry / Estimation of elements: Lassaigne, Kjeldahl, Carius

NEET levelSingle correct optionDifficulty 1 of 3si169

Kjeldahl's method cannot be used for the estimation of nitrogen in

Aaniline, $C X_{6} H X_{5} NH X_{2}$
Bnitrobenzene, $C X_{6} H X_{5} NO X_{2}$
Cethanamide, $CH X_{3} CONH X_{2}$
Dbenzylamine, $C X_{6} H X_{5} CH X_{2} NH X_{2}$

Answer: B

In Kjeldahl digestion with conc.

H X_{2} SO X_{4}

, nitrogen of amines and amides is converted to

(NH X_{4}) X_{2} SO X_{4}

. Nitro, azo and ring nitrogen compounds are not completely converted, so nitrobenzene is the compound for which the method fails.

Practice Structural Identification and Practical Organic Chemistry More on Estimation of elements: Lassaigne, Kjeldahl, Carius

Previous questionNext question

More questions on Estimation of elements: Lassaigne, Kjeldahl, Carius