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Byju's Answer

Standard XII

Chemistry

Nucleophile

Assertion :Wh...

Question

Assertion :When acetamide reacts with $N a O H$ and $B r_{2}$ , methyl amine is formed. Reason: The reaction occurs through intermediate formation of isocyanate.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

$C H_{3} C O N H_{2} + B r_{2} + 4 N a O H ⟶ C H_{3} N H_{2} + N a_{2} C O_{3} + 2 N a B r + 2 H_{2} O$

The reaction occurs through intermediate formation of alkyl isocyanate which on hydrolysis gives methylamine and sodium carbonate.

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Assertion – The non-fusible impurities present in iron ore are removed by $C a C O_{3}$ .

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Assertion (A) Phenol forms 2, 4, 6-tribromophenol on treatment with $B r_{2}$ in carbon disulphide at 273K.
Reason (R) Bromine polarises in carbon disulphide.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
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Assertion (A) All collision of reactant molecules lead to product formation.

Reason (R) Only those collisions in which molecules have correct orientation and sufficient kinetic energy lead to compound formation.

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(c) Assertion is correct, but reason is incorrect
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Assertion :When acetamide reacts with NaOH and Br2, methyl amine is formed. Reason: The reaction occurs through intermediate formation of isocyanate.

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.CH3CONH2 +Br2+ 4NaOH⟶CH3NH2 +Na2CO3 + 2NaBr +2H2OThe reaction occurs through intermediate formation of alkyl isocyanate which on hydrolysis gives methylamine and sodium carbonate.

Assertion :When acetamide reacts with $N a O H$ and $B r_{2}$ , methyl amine is formed. Reason: The reaction occurs through intermediate formation of isocyanate.