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प्रश्न
Why can aryl halides not be prepared by reaction of phenol with \[\ce{HCl}\] in the presence of \[\ce{ZnCl2}\]?
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उत्तर
Aryl halides can't be prepared by reaction of phenol with \[\ce{HCl}\] in presence of \[\ce{ZnCl2}\] because the carbon-oxygen bond in phenols has partial double bond character and it, being stronger than a single bond, is difficult to break.
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संबंधित प्रश्न
Draw the structure of major monohalo products in the following reaction:
Name the following halide according to the IUPAC system and classify it as an alkyl, allyl, benzoyl (primary, secondary, tertiary), vinyl or aryl halide:
CH3CH2CH(CH3)CH(C2H5)Cl
Name the following halide according to the IUPAC system and classify it as an alkyl, allyl, benzoyl (primary, secondary, tertiary), vinyl or aryl halide:
CH3CH2C(CH3)2CH2I
Name the following halide according to the IUPAC system and classify it as an alkyl, allyl, benzoyl (primary, secondary, tertiary), vinyl or aryl halide:
CH3C(Cl)(C2H5)CH2CH3
Name the following halide according to the IUPAC system and classify it as an alkyl, allyl, benzoyl (primary, secondary, tertiary), vinyl or aryl halide:
CH3CH = C(Cl)CH2CH(CH3)2
Name the following halide according to the IUPAC system and classify it as an alkyl, allyl, benzoyl (primary, secondary, tertiary), vinyl or aryl halide:
CH3CH = CHC(Br)(CH3)2
Name the following halide according to the IUPAC system and classify it as an alkyl, allyl, benzoyl (primary, secondary, tertiary), vinyl or aryl halide:
p-ClC6H4CH2CH(CH3)2
Which is the correct IUPAC name for \[\begin{array}{cc}
\ce{CH3 - CH - CH2 - Br}\\
\phantom{}|\phantom{.......}\\
\phantom{}\ce{C2H5}\phantom{....}
\end{array}\]?
Match the items of Column I and Column II.
| Column I | Column II | |
| (i) | SN1 reaction | (a) vic-dibromides |
| (ii) | Chemicals in fire extinguisher | (b) gem-dihalides |
| (iii) | Bromination of alkenes | (c) Racemisation |
| (iv) | Alkylidene halides | (d) Saytzeff rule |
| (v) | Elimination of HX from alkylhalide | (e) Chlorobromocarbons |
Classify the following compound as a primary, secondary and tertiary halide.
1-Bromobut-2-ene
Why are haloalkanes more reactive towards nucleophilic substitution reactions than haloarenes and vinylic halides?
Two isomers (A) and (B) with molar mass 184 g/mol and elemental composition C 52.2%; H 4.9% and Br 42.9% gave benzoic acid and p-bromobenzoic acid, respectively on oxidation with KMnO4. Isomer ‘A’ is optically active and gives a pale yellow precipitate when warmed with alcoholic AgNO3. Isomer ‘A’ and ‘B’ are, respectively:
Name the following halide according to IUPAC system and classify them as alkyl, allyl, benzyl (primary, secondary, tertiary), vinyl or aryl halide:
\[\ce{CH3C(C2H5)2CH2Br}\]
Name the following halide according to IUPAC system and classify them as alkyl, allyl, benzyl (primary, secondary, tertiary), vinyl or aryl halides:
\[\ce{CH3C(Cl)(C2H5)CH2CH3}\]
Name the following halide according to IUPAC system and classify as alkyl, allyl, benzyl (primary, secondary, tertiary), vinyl or aryl halides:
\[\ce{CH3C(C2H5)2CH2Br}\]
Name the following halide according to IUPAC system and classify as alkyl, allyl, benzyl (primary, secondary, tertiary), vinyl or aryl halide:
\[\ce{CH3CH2C(CH3)2CH2I}\]
Name the following halide according to IUPAC system and classify as alkyl, allyl, benzyl (primary, secondary, tertiary), vinyl or aryl halides:
\[\ce{CH3C(C2H5)2CH2Br}\]
Draw the structure of major monohalo products in the following reaction:
