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Amines NEET Questions — Free MCQ Practice

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In qualitative analysis, in order to detect second group basic radical, $H_2S$ gas is passed in the presence of dilute HCl to [KCET 2004]

A. Increase in dissociation of $ H_2S $ B. Decrease the dissociation of salt solution C. Decrease the dissociation of $ H_2S $ D. Increase the dissociation of salt solution

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Explanation

In qualitative analysis, the passage of $H_2S$ gas in the presence of dilute HCl is used to detect second group basic radicals (like $Cu^{2+}$, $Pb^{2+}$, etc.). The presence of HCl decreases the dissociation of $H_2S$ due to the common ion effect. This ensures that only the second group radicals, which form insoluble sulfides, precipitate out.

$$ H_2S ightleftharpoons 2H^+ + S^{2-} $$

The addition of HCl increases the concentration of $H^+$ ions, shifting the equilibrium to the left and thus decreasing the dissociation of $H_2S$.

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Which of the Following reactions does not yield an amine ?

A. $ R - X + NH_3 \rightarrow $ B. $ R - CH = N.OH [ H ] \rightarrow $ C. $ R - CN + H_2O \rightarrow $ D. $ R - CONH_2 \rightarrow $

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Explanation

The reaction $ R - CN + H_2O ightarrow $ does not yield an amine. Instead, it leads to the formation of a carboxylic acid. The correct reaction for the formation of amines from nitriles involves hydrogenation, not hydrolysis.

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

A. Ethanamide B. Propanamide C. Benzenamide D. Acetanilide

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Explanation

Acetanilide will not undergo Hofmann bromamide reaction because it is an aromatic amide. The Hofmann bromamide reaction is specific to aliphatic amides, where the amide is converted to an amine with one less carbon atom. Acetanilide (aromatic amide) does not fit this criterion.

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Which of the following represents the poisonous gas which caused Bhopal tragedy in 1984 ?

A. $ CH_3 - N = C = O $ B. $ CH_3 - N = C = S $ C. $ CH_3 - CH = N = S $ D. $ CH_3 - O - N \rightarrow S $

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Explanation

The poisonous gas that caused the Bhopal tragedy in 1984 was methyl isocyanate, which has the chemical formula $CH_3 - N = C = O$. This compound is highly toxic and can cause severe respiratory and other health issues.

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Phenyl isocyanide is prepared by which of the Following reaction ?

A. Hoffmann reaction B. Carbylamine reaction C. Reimer-Tiemann reaction D. Wurtz reaction

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Explanation

Phenyl isocyanide is prepared by the Carbylamine reaction. In this reaction, aniline reacts with chloroform in the presence of a base like KOH to produce phenyl isocyanide.

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What is the end product (B) in the following reaction sequence ? $ Butanamide \rightarrow A \rightarrow B $

A. n - butylamine B. n - propylcyanide C. Propyl isocyanide D. n - Propylamine

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Identify the compound "X" in the Following reactions. $ CH_3 NO_2 \rightarrow [X} \rightarrow CHCl_3 $

A. $ ClCH_2 NO_2 $ B. $ CH_3 Cl$ C. $ Cl_2 CHNO_2 $ D. $ Cl_3 CNO_2 $

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Explanation

$ C Cl_3 NO_2 Known as "Chloropicrin" (X) $

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Which of the following amines can not be Prepared by Gabriel - Phthalimide reaction ?

A. Benzylamine B. Ethylamine C. Aniline D. Methylamine

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Explanation

Primary aromatic amine can not be prepared by this method because nucleophile aryl halide, does not become favourable anion for phthalimide.

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In $ (CH_3)_3 N $ the state of hybridization of N-atom and the Spatial rearrangement of methyl groups around it are respectively.

A. $ SP^3 , Pyramidal $ B. $ SP^3 , Tetrahedral $ C. $ SP ^2 , Trigonal Planar $ D. $ SP^3 , Trigonal Planar $

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Explanation

In Trimethylamine ((CH_3)_3N), the nitrogen atom is bonded to three methyl groups and has a lone pair of electrons. The hybridization state of the nitrogen atom is sp^3, which leads to a tetrahedral arrangement of the bonding pairs and lone pair around the nitrogen. However, the presence of the lone pair causes the shape to be pyramidal rather than a perfect tetrahedron.

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The pKa Values of same bases are given below pick out the weakest base.

A. 4.4 B. 4 C. 2.88 D. 10.68

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Explanation

Higher value of Kb (or lower value of $ pK_b$ ) Shows more basicity of amine. pKa + p Kb = 14 p Kb = - log Kb For option (C) p Kb = 2.88 hence, p Kb = 14 - 2.88 p Kb = 11.12

Amines MCQs for NEET — Chemistry Questions with Answers

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