Organic Compounds Containing Nitrogen Test

Result

Organic Compounds Containing Nitrogen Test - 7

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following amides will not undergo Hofmann bromamide reaction?

A
CH₃CONH₂

B
CH₃CH₂CONH₂

C
C₆H₅CONH₂

D
CH₃CONHCH₃

Solution

Only primary amides undergo Hofmann bromamide reaction. Since CH₃CONHCH₃ is a 2^o amide, so it does not undergo Hofmann bromamide reaction.
Question 2
1 / -0

Which of the following statements is not correct?

A
Methylamine is more basic than NH₃.

B
Amines form hydrogen bonds.

C
Ethylamine has higher boiling point than propane.

D
Dimethylamine is less basic than methylamine.

Solution

Dimethylamine is more basic than methylamine. Therefore, statement (4) is not correct.
Question 3
1 / -0

The pK_a or pK_b values of some bases are given below. Pick out the weakest base.

A
pK_b = 9.40

B
pK_a = 11.12

C
pK_a = 4.0

D
pK_b = 3.32

Solution

The lower the pK_b or the higher the pK_a, the stronger the base. This is due to the reason that pK_a + pK_b = 14. Therefore, pK_b of base (2) = 14 – pK_a = 14 – 11.12 = 2.88 and pK_b of base (3) = 14 – 4 = 10.

Thus, the base (3) with the highest pK_b (= 10.0) is the weakest base.