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कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

Assertion: KCN reacts with methyl chloride to give methyl isocyanide. Reason: CN– is an ambident nucleophile.

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प्रश्न

Assertion: KCN reacts with methyl chloride to give methyl isocyanide.

Reason: CN is an ambident nucleophile.

विकल्प

  • Assertion and reason both are correct and reason is correct explanation of assertion.

  • Assertion and reason both are wrong statements.

  • Assertion is correct but reason is wrong statement.

  • Assertion is wrong but reason is correct statement.

  • Assertion and reason both are correct statements but reason is not correct explanation of assertion.

MCQ
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उत्तर

Assertion is wrong but reason is correct statement.

Explanation:

\[\ce{\underset{Alkyl cyanide}{R - Cl + KCN –> R - CN + KCl}}\]

Isocyanide is not obtained in this reaction. CN is an ambident nucleophile.

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अध्याय 10: Haloalkanes and Haloarenes - Exercises [पृष्ठ १४८]

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एनसीईआरटी एक्झांप्लर Chemistry Exemplar [English] Class 12
अध्याय 10 Haloalkanes and Haloarenes
Exercises | Q V. 87. | पृष्ठ १४८

संबंधित प्रश्न

Given reasons: C–Cl bond length in chlorobenzene is shorter than C–Cl bond length in CH3–Cl.


Which would undergo SN2 reaction faster in the following pair and why ?


Write the structures of A, B and C in the following:


Write the mechanism of the following reaction:

\[\ce{{n}BuBr + KCN ->[EtOH-H2O] {n}BuCN}\]


Arrange the following organic compounds in descending order of their reactivity towards SN1 reaction.

C6H5CH2Br, C6H5CH(C6H5)Br, C6H5CH(CH3)Br, C6H5C(CH3)(C6H5)Br


Which of the following is optically inactive?


Which of the following is an example of SN2 reaction?


The order of reactivity of the given haloalkanes towards nucleophile is:


In the SN1 reaction, racemization takes place. It is due to:


The order of reactivities of the following alkyl halides for an SN2 reaction is:


The increasing order of reactivity towards SN1 mechanism is:

(I) \[\begin{array}{cc}
\ce{CH3-CH-CH2-CH3}\\
|\phantom{........}\\
\ce{CH3}\phantom{.....}
\end{array}\]

(II) CH3CH2CH2Cl

(III) P–CH3O–C6H4–CH2Cl


A primary alkyl halide would prefer to undergo ______.


Match the reactions given in Column I with the types of reactions given in Column II.

  Column I Column II
(i) (a) Nucleophilic aromatic substitution
(ii) \[\begin{array}{cc}
\ce{CH3 - CH = CH2 + HBr -> CH3 - CH - CH3}\\
\phantom{............................}|\phantom{}\\
\phantom{.............................}\ce{Br}\phantom{}
\end{array}\]
(b) Electrophilic aromatic substitution
(iii) (c) Saytzeff elimination
(iv) (d) Electrophilic addition
(v) \[\begin{array}{cc}
\ce{CH3  CH2 CH CH3 ->[alc.KOH] CH3  CH = CH CH3}\\
\phantom{}|\phantom{..........................}\\
\phantom{}\ce{Br}\phantom{........................}
\end{array}\]
(e) Nucleophilic substitution (SN1)

Why are aryl halides less reactive towards nucleophilic substitution reactions than alkyl halides?


Which of the following is the definition of chirality?


CCl4 is insoluble in water because:-


In SN1 reactions, the correct order of reactivity for the following compounds:

CH3Cl, CH3CH2Cl, (CH3)2CHCl and (CH3)3CCl is ______.


The decreasing order of reactivity of the following compounds towards nucleophilic substitution (SN2) is ______.






Identify the product in the following reaction: 


Which of the following is halogen exchange reaction?


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