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Amines

Short Answer Type

201.

Give one chemical test to distinguish between the following pairs of compounds.
Aniline and N — methlyaniline.

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202.

Account for the following:
pK_b of aniline is more than that of methylamine.

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203.

Account for the following:
Ethylamine is soluble in water, whereas aniline is not.

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204.

Account for the following:
Methylamine in water reacts with ferric chloride to precipitate ferric hydroxide.

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205. Account for the following:
Although amino group is o- and p-directing for aromatic electrophilic substitution reaction, aniline on nitration gives a substantial amount of m-nitro aniline.

The nitration of aniline is carried out using conc. HNO₃ and H₂SO₄. However, in the presence of conc. H₂SO₄, aniline forms aniline hydrogen sulphate in which the anilinium ion, C₆H₅NH₃⁺ is meta directing because the positive charge on the nitrogen attracts electrons from the benzene ring.

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206. Account for the following:
Aniline does not undergo Friedel Craft's reaction.

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207. Account for the following:
Diazonium ions of aromatic amines are more stable than those of aliphatic amines.

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208. Account for the following:
Gabriel phthalimide synthesis is preferred for the synthesizing amines.

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209.

Arrange the following:
In decreasing order of the pK_b values C₂H₅NH₂, C₆H₅ NHCH₃, (C₂H₅)₂NH and C₆H₅NH_2.

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210.

Arrange the following:
In decreasing order of basic strength:
C₆H₅NH₂, C₆H_sN(CH₃)₂, (C₂H₅)₂NH and CH₃NH₂

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Previous Year Papers

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Short Answer Type

205. Account for the following:Although amino group is o- and p-directing for aromatic electrophilic substitution reaction, aniline on nitration gives a substantial amount of m-nitro aniline.

205. Account for the following:
Although amino group is o- and p-directing for aromatic electrophilic substitution reaction, aniline on nitration gives a substantial amount of m-nitro aniline.