Amines

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans:  (B) 

The reaction of transformation of primary alkyl halides to primary amines using potassium phthalimide is the Gabriel phthalimide reaction. 

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans:  (B) 

Diazonium salts react with copper powder and halogen acid to form aryl halide.

Gattermann reaction is a Sandmeyer reaction variant in which Cu powder replaces CuCl.

This substitution produces aryl halide more easily and under milder conditions than the Sandmeyer reaction.

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: (A) 

On Reaction of acid anhydrides with primary amines, amides are formed as the primary product along with carboxylic acid. 

(RCO)₂O + RNH₂? RCONH₂ + RCOOH

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans:  (B) 

Greater will be the basic character, greater will be its reactivity towards dilute hydrochloric acid. As, (B), secondary amine, it will be the most basic among all and hence the most reactive amine towards acid. 

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: (C) 

Using active metals like iron in acidic conditions can be efficiently used for the reduction of nitro compounds. 

Under the acidic conditions, the intermediate compounds that may form are readily reduced to primary amine and pure product of primary amine is obtained. 

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: (C)

In the process of nitration of benzene, firstly H₂SO₄ dissociates into H⁺ and HSO₄−. The proton produced further reacts with HNO₃ to give a positively charged complex that is unstable and dissociates into nitronium ions and water as products. The nitronium ion is an electron-deficient species i.e. electrophile that attacks the electron cloud of the benzene ring.

H₂SO₄  (conc.) ? H⁺+HSO₄⁻

H⁺+HNO₃? H₂NO₃⁺

H₂NO₃⁺? NO₂⁺ + H2O

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: (B) 

Primary aliphatic amines react with nitrous acid to form aliphatic diazonium salts, which are unstable and release nitrogen gas and alcohol quantitatively.

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: (C)

Methyl amine reacts with HNO₃ form methanol with release of nitrogen gas and water as side products.

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: (D) 

The greater the electron density towards the ring, the greater its basic strength.

The electron withdrawing group reduces basic strength, whereas the electron donating group increases basic strength.

This is a Multiple Choice Questions as classified in NCERT Exemplar

Ans: (B) 

Hoffmann invented a method for producing primary amines by treating an amide with bromine in an aqueous or ethanolic sodium hydroxide solution. An alkyl or aryl group migrates from the amide's carbonyl carbon to the nitrogen atom during this degradation reaction.