How many of the following are soluble in water?
(i) Ethylamine (ii) Aniline

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Solution

Ethylamine is a low molecular weight amine. It forms hydrogen bonds with water. Hence, it is soluble in water.
Aniline is a high molecular weight amine. It has large hydrocarbon part which interferes in the hydrogen bond formation.
Hence, it is insoluble in water.

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Q. Account for the following:
(i)

p K_{b}

of aniline is more than that of methylamine.
(ii) Ethylamine is soluble in water whereas aniline is not.
(iii) Methylamine in water reacts with ferric chloride to precipitate hydrated ferric oxide.

Which among the following are the correct statements?

Statement 1: Ethylamine is soluble in water, whereas aniline is not.

Statement 2: Ethyl amine forms hydrogen bonds with water molecules.

Q. Ethylamine is not soluble in water whereas aniline is.
If this is true enter 1, if false enter 0.

Q. Give one chemical test to distinguish between the following pairs of compounds:
(i) Ethanol and

2

propanol.
(ii) Aniline and ethylamine.

Account for the following:

(i) pK_bof aniline is more than that of methylamine.

(ii) Ethylamine is soluble in water whereas aniline is not.

(iii) Methylamine in water reacts with ferric chloride to precipitate hydrated ferric oxide.

(iv) Although amino group is o, p− directing in aromatic electrophilic substitution reactions, aniline on nitration gives a substantial amount of m-nitroaniline.

(v) Aniline does not undergo Friedel-Crafts reaction.

(vi) Diazonium salts of aromatic amines are more stable than those of aliphatic amines.

(vii) Gabriel phthalimide synthesis is preferred for synthesising primary amines.

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How many of the following are soluble in water?(i) Ethylamine (ii) Aniline

Ethylamine is a low molecular weight amine. It forms hydrogen bonds with water. Hence, it is soluble in water.Aniline is a high molecular weight amine. It has large hydrocarbon part which interferes in the hydrogen bond formation.Hence, it is insoluble in water.

How many of the following are soluble in water?
(i) Ethylamine (ii) Aniline

Ethylamine is a low molecular weight amine. It forms hydrogen bonds with water. Hence, it is soluble in water.
Aniline is a high molecular weight amine. It has large hydrocarbon part which interferes in the hydrogen bond formation.
Hence, it is insoluble in water.