NEET Amines — Set 13

Question 1

Which amine has the highest boiling point among the following?

Accepted Answer

Primary amines like $ \ce{CH3CH2CH2NH2} $ have higher boiling points due to extensive hydrogen bonding compared to secondary and tertiary amines, as per the PDF.

Question 2

Which amine produces a white precipitate with excess $ \ce{Br2} $ in water?

Accepted Answer

Aniline ($ \ce{C6H5NH2} $) reacts with excess $ \ce{Br2} $ in water to form 2,4,6-tribromoaniline, a white precipitate, as per the PDF’s chemical properties.

Question 3

The number of carbon atoms in the amine produced from $ \ce{CH3CH2CH2CH2CONH2} $ via Hoffmann bromamide reaction is:

Accepted Answer

Pentanamide ($ \ce{CH3CH2CH2CH2CONH2} $, 5 carbons) loses one carbon in the Hoffmann reaction, yielding $ \ce{CH3CH2CH2CH2NH2} $ (4 carbons), as per the PDF.

NEET Chemistry: Amines — Practice Set 13

Q1. Which amine has the highest boiling point among the following?

Q2. Which amine produces a white precipitate with excess \( \ce{Br2} \) in water?

Q3. The number of carbon atoms in the amine produced from \( \ce{CH3CH2CH2CH2CONH2} \) via Hoffmann bromamide reaction is:

Q4. The reagent used in the Hinsberg test to differentiate amines is:

Q5. The number of bromine atoms substituted on \( \ce{C6H5NH2} \) with excess \( \ce{Br2} \) in water is:

Q6. Which amine has the highest \( pK_b \) value in aqueous solution?

Q7. Which amine’s boiling point is least affected by hydrogen bonding?

Q8. The product of aniline reacting with \( \ce{H2SO4} \) at high temperature (453-473 K) is:

Q9. The product of the reduction of \( \ce{C6H5CH2NO2} \) with \( \ce{Sn/HCl} \) is:

Q10. Which amine has the smallest carbon chain among the following?