Amines MCQs for NEET — Chemistry Questions with Answers

When potassium thiocyanate (KSCN) solution reacts with ferric chloride (FeCl3), it forms a blood-red colored complex ion called the thiocyanate ion [Fe(SCN)]2+. This reaction is used as a test for Fe3+ ions and is known as the Prussian blue test.

The given organic compound with the molecular formula C6H5O2N has 6 carbon atoms in a ring system, three double bonds, and a nitro group (-NO2) as a substituent. This compound is nitrobenzene, which is both homocyclic (contains only carbon atoms in the ring) and aromatic.

The Hofmann bromamide reaction is a method for converting an amide into an alkylamine with one more carbon atom than the starting material. It involves treating the amide with bromine and then an alkoxide base, and is the appropriate reaction for converting acetamide to methanamine.

Arylamines are generally less basic than alkylamines because the nitrogen lone pair electrons in arylamines are delocalized by interaction with the aromatic ring π-electron system, making the nitrogen atom less available for protonation, which reduces the basicity.

Due to resonance in chlorobenzene C-Cl bond acquires double bond character hence, C-Cl bond is inert towards nucleophile (phthalimide ion).

The stability of diazonium salts increases with an increase in the delocalization of the positive charge over the aromatic ring. The benzene diazonium salt (o2) is more stable than the aliphatic diazonium salts (o1 and o3) due to better delocalization of the positive charge.

 The hormone which is proteinous in nature are said to be amine hormone because protein are the polymers of polypeptides and polypeptides are made up of amino acids. Amino acid contains amino group.

Thyroxin is an amine hormone. It is secreted by thyroid gland. Its function is to control the metabolism of carbohydrates, proteind and lipids.

(c) ${\mathrm{CH}}_3\mathrm{CN}\stackrel{\mathrm{Na}/{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}}{\to }$${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{NH}}_2$$\stackrel{{\mathrm{HNO}}_2}{\to }$${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH}$$\stackrel{\left[\mathrm{O}\right]}{\to }$${\mathrm{CH}}_3\mathrm{CHO}$$\stackrel{\mathrm{Tollens} \mathrm{reagent}}{\to }$${\mathrm{CH}}_3\mathrm{COOH}$