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Arrange the following in the decreasing ...

Arrange the following in the decreasing order of `pK_b` values
I. `C_2H_5NH_2` , II. `C_6H_5NHCH_3`, III. `(C_2H_5)_2NH`, IV . `C_6H_5NH_2`

A

`IV gt II gt I gt III`

B

`IV gt II gt III lt I`

C

`I gt III gt IV gt II`

D

`I gt III gt II gt IV`

Text Solution

Verified by Experts

The correct Answer is:
A
Presence of electron donating methyl group increases the basicity of amines. However, `3^@` amines in aqueous solution are less basic due to steric hindrance .
Aliphatic amines are more basic than aromatic amines because in later, lone pair takes part in delocalisation, so less available for donation.
`C_6H_5NH_2 gt C_6H_5NHCH_3 gt C_2H_5NH_2 gt (C_2H_5)_2NH`.
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MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-ORGANIC COMPOUNDS CONTAINING NITROGEN -EXERCISE 2 (MISCELLANEOUS PROBLEMS )
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  2. Primary amine is not formed in the reaction of I. hydrolysis of RCN...

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  3. Arrange the following in the decreasing order of pKb values I. C2H5N...

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  4. The end-product of the following reaction is

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  5. In the chemical reactions, the compounds 'A' and 'B' respectively ar...

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  6. Identify the product of the following reaction.

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  7. Benzaldehyde reacts with CH3NH2 forming

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  8. Which A gives red colour in the reaction A overset ((i) HNO2)unders...

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  10. CH3NH2 reacts with alpha , beta-unsaturated ketone as shown Select...

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  11. When aniline reacts with oil of bitter almonds (C(6)H(5)CHO) condensat...

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  12. The main product of the reaction of CH3CONH2 with Br2 in aqueous potas...

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  13. Nitrobenzene on reaction with conc. (HNO3)/(H2SO4) at 80-100^@C forms ...

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  14. Nitrobenzene gives N-phenylhydroxylamine by

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  15. In the following reaction, the product (A) is

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  16. An aromatic compound A (C7H9N) on reacting with NaNO2 / HCI at 0^@C fo...

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  17. Which of the following is not the property of ethanenitrile (CH3CN) ?

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  18. CHCl(3) and KOH on heating with a compound form a bad smelling produc...

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  19. In the following reaction sequence predict the compound X and Y. ...

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  20. Coupling of diazonium salts of following takes place in the order

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