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Match type Questions Column I (A) Benzene (B) Ethene ('C) Ethyne (D) Butane Column II (p) Wrutz reaction of $ C_2 H_5 Cl $ (q) Evolves $ H_2 $ when heated with sodium metal ('r) Dehydration of ethanol (s) Electrophilic subsitution

A. A (s) B ('r) C (q) D (p ) B. A ('r) B (s) C ( q) D (p) C. A ('r) B (p ) C ( s) D (q) D. A (q) B (r) C ( p) D (s)

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Explanation

The correct matching is: A (s) Benzene undergoes electrophilic substitution reactions. B (r) Ethene can be obtained by the dehydration of ethanol. C (q) Ethyne evolves hydrogen when heated with sodium metal. D (p) Butane can be prepared by the Wurtz reaction of ethyl chloride.

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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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Choose the proper option for given statement on the basis of physical properties Statement : (i) Alkyl isocyanides have bad odours while alkyl cyanides have pleasant odours. Statement : (ii) Alkyl cynanides are poisonous compounds. Statement : (iii) The boiling points of alkyl cyanides are lower than their isomeric alkyl-isocynides. Statement : (iv) Acetonitrile is soluble in water but methylcarbylamine is not.

A. TTTF B. TFTF C. TFFF D. TFFT

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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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