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

True

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False

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Solution

The correct option is A True
Methylamine in water reacts with ferric chloride to precipitate hydrated ferric oxide.
The $+ I$ effect of methyl group makes methyl amine more basic than water. Methyl amine reacts with water to produce hydroxide ions.
$C H_{3} - N H_{2} + H_{2} O \to C H_{3} - N H_{3}^{+} + O H^{-}$
Hydroxide ions react with ferric chloride to precipitate hydrated ferric oxide ( $F e_{2} O_{3} \cdot 3 H_{2} O$ ).
$2 F e C l_{3} + 6 O H^{-} \to F e_{2} O_{3} \cdot 3 H_{2} O + 6 C l^{-}$

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Similar questions

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: Methyl-amine in water reacts with ferric chloride to precipitate hydrated ferric oxide.

Statement 2: Methylamine is more basic than ammonia.

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.

Q. Which precipitate is formed when ferric chloride reacts with caustic soda?

[1 mark]

Account for the following

(i) $p K_{b}$ of aniline is more than that of methyl amine.

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

(iii) Methyl amine in water reacts with ferric chloride to precipitate hydrated ferric oxide

(iv) Although amino group is o- and p- directing in aromatic electrophilic substitution, 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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