NEET Amines — Set 12

Question 1

How many moles of $ \ce{Br2} $ react with one mole of $ \ce{C6H5NH2} $ in excess bromine water?

Accepted Answer

Aniline reacts with excess $ \ce{Br2} $ in water to form 2,4,6-tribromoaniline, requiring 3 moles of $ \ce{Br2} $ for three substitutions, as per the PDF.

Question 2

Which amine is produced from $ \ce{CH3CH2CH2CH2CONH2} $ via Hoffmann bromamide reaction?

Accepted Answer

Pentanamide ($ \ce{CH3CH2CH2CH2CONH2} $) loses one carbon in the Hoffmann reaction to form butan-1-amine ($ \ce{CH3CH2CH2CH2NH2} $), as per the PDF.

Question 3

Which amine forms a precipitate with benzenesulphonyl chloride that is insoluble in excess NaOH?

Accepted Answer

Secondary amines like $ \ce{CH3NHCH2CH3} $ form sulphonamides insoluble in alkali, unlike primary amines, as per the PDF’s Hinsberg test.

NEET Chemistry: Amines — Practice Set 12

Q1. How many moles of \( \ce{Br2} \) react with one mole of \( \ce{C6H5NH2} \) in excess bromine water?

Q2. Which amine is produced from \( \ce{CH3CH2CH2CH2CONH2} \) via Hoffmann bromamide reaction?

Q3. Which amine forms a precipitate with benzenesulphonyl chloride that is insoluble in excess NaOH?

Q4. An amine \( X \) forms \( \ce{CH3CH2CH2OH} \) with \( \ce{HNO2} \) and \( \ce{CH3CH2CH2NC} \) with \( \ce{CHCl3} \) + KOH. \( X \) is:

Q5. Which property of \( \ce{-NH2} \) in aniline directs electrophilic substitution to ortho and para positions?

Q6. The product of \( \ce{CH3CH2CH2NH2} \) with \( \ce{HNO2} \) at 273-278 K is:

Q7. Which amine does not form a nitrosamine with \( \ce{HNO2} \)?

Q8. The number of hydrogen bonds \( \ce{(CH3)2NH} \) can form with water is:

Q9. Which amine forms a sulphonamide soluble in alkali with benzenesulphonyl chloride?

Q10. The product of \( \ce{C6H5CH2Cl} \) reacting with excess \( \ce{NH3} \) is: