Question

Nitrogen gas is evolved when $ HN{{O}_{2}} $ reacts with:
(A) $ {{C}_{6}}{{H}_{5}}-C\left( =O \right)-C{{H}_{2}} $
(B) $ {{C}_{6}}{{H}_{5}}-C\left( =O \right)-N{{H}_{2}} $
(C) $ C{{H}_{3}}-C{{H}_{2}}-N{{H}_{2}} $
(D) $ N{{H}_{2}}-C\left( =O \right)-N{{H}_{2}} $

Answer 1

Hint :We know that urea is an organic compound also known as carbamide. It is a waste compound of the living organism. It is the major compound of human urine. It can break the amino acid chain which can make proteins. This is known as carbamylation. Extra nitrogen is expelled from the body through urea.

Complete Step By Step Answer:
As we know, Ammonia is also known as nitrogen trihydride or azane. The chemical formula of ammonia is $ N{{H}_{3}}. $ The molecule has a trigonal pyramidal shape. Three hydrogen atoms are connected with sole nitrogen. The nitrogen atom with a single electron pair makes ammonia to be a base. Research studies have found out that ammonia can have a toxic effect on the glial and nerve cells of the brain. While in healthy people, ammonia is converted into urea in the liver which is eventually washed out with urine, there could be excessive concentration of ammonia in blood for people with impaired liver function. The higher levels lead to ammonia toxicity triggering seizures and coma. It can form a homogenous mixture with water and owing to the hydrogen bonds it can form ammonia, which is a polar molecule. The first organic compound which was synthesized in $ 1828 $ is urea or ammonium cyanate, the chemical formula of urea is $ N{{H}_{2}}CON{{H}_{2}}. $ This organic compound was synthesized by the German chemist “Wohler”. The formation reaction of urea is given as: $ C{{O}_{2}}+2N{{H}_{3}}\to N{{H}_{2}}CON{{H}_{2}}+{{H}_{2}}O. $
Here, $ N{{H}_{2}}-C\left( =O \right)-N{{H}_{2}}\xrightarrow{HN{{O}_{2}}}N\equiv \overset{\oplus }{\mathop{N}}\,-C\left( =O \right)-\overset{\oplus }{\mathop{N}}\,\equiv N $
On further solving, we get;
 $ N\equiv \overset{\oplus }{\mathop{N}}\,-C\left( =O \right)-\overset{\oplus }{\mathop{N}}\,\equiv N\to OH-N\equiv \overset{\oplus }{\mathop{N}}\,-C\left( =O \right)-\overset{..}{\mathop{O}}\,H+{{N}_{2}} $
Therefore, the correct answer is option D.

Note :
Remember that urea is also used in many skin conditions like dry or rough, some diseases like, corns callus. Also, for some nail problems like ingrown nails. It is also used to remove the dead tissues from the wound to help to heal. Urea is one of the most important nitrogenous fertilizers in the market. It is a white crystalline organic compound. It is a water-soluble compound.