Among the following, the total number of compounds which give positive Lassaigne's test for nitrogen is/are. i NH 2 OH ii H 2 N - NH 2 iii H 2 N - CO - NH 2 iv NH 2- C 6 H 5- COOH v NH 2- CS - NH 2 vi NH 2- C 6 H 4- SO 3 H

Question

Among the following, the total number of compounds which give positive Lassaigne's test for nitrogen is/are. i NH 2 OH ii H 2 N - NH 2 iii H 2 N - CO - NH 2 iv NH 2- C 6 H 5- COOH v NH 2- CS - NH 2 vi NH 2- C 6 H 4- SO 3 H (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

NH 2 OH , H 2 N - NH 2 does not contain ' C '-atom in it to form NaCN with sodium metal and hence will not show positive Lassaigne's test for nitrogen.

i	$N H_{2} O H$
ii	$H_{2} N - N H_{2}$
iii	$H_{2} N - CO - N H_{2}$
iv	$N H_{2} - C_{6} H_{5} - COO H$
v	$N H_{2} - CS - N H_{2}$
vi	$N H_{2} - C_{6} H_{4} - S O_{3} H$

Q. Among the following, the total number of compounds which give positive Lassaigne's test for nitrogen is/are_______.

i $N H_{2} O H$

ii $H_{2} N - N H_{2}$

iii $H_{2} N - CO - N H_{2}$

iv $N H_{2} - C_{6} H_{5} - COO H$

v $N H_{2} - CS - N H_{2}$

vi $N H_{2} - C_{6} H_{4} - S O_{3} H$

$N H_{2} O H, H_{2} N - N H_{2}$ does not contain ' $C$ '-atom in it to form $N a CN$ with sodium metal and hence will not show positive Lassaigne's test for nitrogen.

Q. Among the following, the total number of compounds which give positive Lassaigne's test for nitrogen is/are_______. i NH2​OH ii H2​N−NH2​ iii H2​N−CO−NH2​ iv NH2​−C6​H5​−COOH v NH2​−CS−NH2​ vi NH2​−C6​H4​−SO3​H

NH2​OH,H2​N−NH2​ does not contain ' C '-atom in it to form NaCN with sodium metal and hence will not show positive Lassaigne's test for nitrogen.

Q. Among the following, the total number of compounds which give positive Lassaigne's test for nitrogen is/are_______.

i $N H_{2} O H$

ii $H_{2} N - N H_{2}$

iii $H_{2} N - CO - N H_{2}$

iv $N H_{2} - C_{6} H_{5} - COO H$

v $N H_{2} - CS - N H_{2}$

vi $N H_{2} - C_{6} H_{4} - S O_{3} H$

$N H_{2} O H, H_{2} N - N H_{2}$ does not contain ' $C$ '-atom in it to form $N a CN$ with sodium metal and hence will not show positive Lassaigne's test for nitrogen.