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प्रश्न
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 |
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उत्तर
| Column I | Column II | |
| (i) | SN1 reaction | (c) Racemisation |
| (ii) | Chemicals in fire extinguisher | (e) Chlorobromocarbons |
| (iii) | Bromination of alkenes | (a) vic-dibromides |
| (iv) | Alkylidene halides | (b) gem-dihalides |
| (v) | Elimination of HX from alkylhalide | (d) Saytzeff rule |
Explanation:
(i) A mixture containing two enantiomers in equal proportions will have zero optical rotation, such a mixture is known as racemic mixture. The process of conversion of enantiomer into a racemic mixture is known as racemisation. If an alkyl halide follows SN1 mechanism then racemisation takes place while if it follows SN2 mechanism than inversion takes places.
(ii) Chlorobromocarbons are used in fire extinguishers.
(iii) In vicinal dihalides, halogen atoms are present on the adjacent carbon atom. Bromination of alkanes will give vicinal dihalides.
(iv) Alkylidene halides are named gem-dihalides. In gem-dihalides halogen atoms are present on same carbon atom.
(v) Elimination of HX from alkylhalide follows Saytzeff rule. This rule states that “in dehydrohalogenation reactions, the preferred product is that alkene which has the greater number of alkyl groups attached to the doubly bonded carbon atoms”.
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संबंधित प्रश्न
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:
(CH3)3CCH2CH(Br)C6H5
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(C2H5)2CH2Br
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
Which of the following compounds can be classified as aryl halides?
(i) \[\ce{p-ClC6H4CH2CH(CH3)2}\]
(ii) \[\ce{p-CH3CHCl(C6H4)CH2CH3}\]
(iii) \[\ce{o-BrH2C - C6H4CH(CH3)CH2CH3}\]
(iv) \[\ce{C6H5 - Cl}\]
Why can aryl halides not be prepared by reaction of phenol with \[\ce{HCl}\] in the presence of \[\ce{ZnCl2}\]?
Match the structures of compounds given in Column I with the classes of compounds given in Column II.
| Column I | Column II | |
| (i) | \[\begin{array}{cc} \ce{CH3 - CH - CH3}\\ |\phantom{..}\\ \ce{X}\phantom{..} \end{array}\] |
(a) Aryl halide |
| (ii) | \[\ce{CH2 = CH - CH2 - X}\] | (b) Alkyl halide |
| (iii) |  |
(c) Vinyl halide |
| (iv) | \[\ce{CH2 = CH - X}\] | (d) Allyl halide |
Classify the following compound as a primary, secondary and tertiary halide.
1-Bromobut-2-ene
Name the following halide according to IUPAC system and classify it as alkyl, allyl, benzyl (primary, secondary, tertiary), vinyl or aryl halide:
\[\ce{CH2CH2C(CH3)2CH2I}\]
Write the structure of the following organic halogen compound.
1,4-Dibromobut-2-ene
Name the following halide according to the IUPAC system and classify it as alkyl, allyl, benzyl (primary, secondary, tertiary), vinyl or aryl halide:
CH3CH2C(CH3)2CH2I
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 halides according to IUPAC system and classify them as alkyl, allyl, benzyl (primary, secondary, tertiary), vinyl or aryl halides:
CH3C(Cl)(C2H5 )CH2CH3
Give the IUPAC name of the compound.
\[\ce{CICH2 C ≡ CCH2 Br}\]
Name the following halide according to IUPAC system and classify them as alkyl, allyl, benzyl (primary, secondary, tertiary), vinyl or aryl halides.
\[\ce{CH3CH2C(CH3)2CH2I}\]
Name the following halides according to IUPAC system and classify them as alkyl, allyl, benzyl (primary, secondary, tertiary), vinyl or aryl halides:
\[\ce{CH3C(Cl)(C2H5)CH2CH3}\]
Draw the structure of major monohalo products in the following reaction:
Which of the following are secondary bromides?
The given compound 
is an example of ______.
