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    number of isomers possible for dichloro cyclohexane

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    How many dichlorocyclohexane would be obtained on chlorination of chlorocyclohexane (including stereoisomers)? (A) 4 (B) 6 (C) 8 (D) 9

    How many dichlorocyclohexane would be obtained on chlorination of chlorocyclohexane (including stereoisomers)? (A) 4 (B) 6 (C) 8 (D) 9. Ans: Hint: The chlorination is the process of the addition of chlorine atoms. The chlorocyclohexane when treated w...

    How many dichlorocyclohexane would be obtained on chlorination of chlorocyclohexane (including stereoisomers)?

    (A) 4 (B) 6 (C) 8 (D) 9 Answer Verified 240.9k+ views

    Hint: The chlorination is the process of the addition of chlorine atoms. The chlorocyclohexane when treated with the chlorine molecule forms dichlorocyclohexane. The dichlorocyclohexane has two chlorine atoms attached to the cyclohexane ring. The positions of the chlorine atoms may vary concerning each other leading to the formation of different stereoisomers in the space.Complete step by step solution:

    Halogens ( C l 2 Cl2 and B r 2 Br2

    ) reacts with the alkanes or the cycloalkanes in the presence of ultraviolet light to form haloalkanes. This reaction is called the free radical substitution reaction and gives a mixture of mono, di, or polysubstituted haloalkanes which are difficult to separate into the pure compound.

    The addition of the chlorine atom to the alkanes for the preparation of the haloalkanes is known as the chlorination. The free radical chlorination is taking place in the ultraviolet light.

    In presence of sunlight or ultraviolet radiation, the bond between the chlorine molecules

    C l 2 Cl2

    undergoes the homolytic fission. Such that the

    C l 2 Cl2

    molecules break down to form two chlorine radicals. the homolytic fission of

    C l 2 Cl2

    molecule is as shown below,

    The chlorine radical attacks on the cyclohexane such that the hydrogen atom is replaced by the chlorine atom the reaction for the synthesis of cyclohexane is as shown below:

    When mono substituted haloalkanes are further treated with the halogen results in the disubstituted haloalkanes. The chlorocyclohexane when treated with the excess of chlorine it is converted into the dichlorocyclohexane.

    When chloro cyclohexane is treated with the chlorine, we get the ortho ( or 1,2 ), meta ( or 1,3 ), and the para ( or 1, 4) disubstituted product. The obtained dichlorocyclohexane products are as follows,

    Let's have a look at the stereoisomers of each product obtained.

    a) Ortho ( or 1,2 ) dichlorocyclohexane: the ortho-dichlorocyclohexane has the three stereoisomers. The one isomer in which the two bonds are above the plane and one when the two bonds

    (C−H) (C−H)

    are below the plane. The ortho product has one more stereoisomer where the one bond is above and below the plane. The three stereoisomers of the ortho-dichlorocyclohexane are as follows:

    b) The meta-dichlorocyclohexane has three stereoisomers. One in which the two bonds are above the plane, below the plane, and the third stereoisomer in which the one bond is above and one is below the plane. The stereoisomers are as follows,

    c) para-dichlorocyclohexane:

    The para isomer of dichlorocyclohexane shares the plane of symmetry. The plane of symmetry passes through the two chlorine atoms. Thus, the para isomer can be expressed into stereoisomers. Thus, it has two isomers.

    d) In these structures, the two chlorine atoms are linked to one carbon atom. As carbon is bonded to the two chlorine atoms hence it does not depict stereoisomerism. It has an achiral carbon centre. Therefore, only one structure is possible.

    Therefore, the total number of structures possible for the chlorocyclohexane is equal to,

    Total number of structure = 3 + 3+ 2 + 2 = 9

    Total number of structure = 3 + 3+ 2 + 2 = 9

    A total of 9 isomers is possible.

    Hence, (D) is the correct option.Note: The chlorine molecule gives a highly reactive radical. In excess of chlorine instead of one product, we may obtain the mixture of the product (di, tri, or polysubstituted chloro alkanes). Here, the second chlorine atom may take the 2, 3, or the 4 positions concerning the first position chlorine atoms. However, there is also a possibility of chlorine at the same carbon. This carbon is achiral as is linked to the same carbon atom and the molecules now possess the plane of symmetry.

    However, the bromine radical is highly selective. Instead of forming a mixture of products, it has given one major product.

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    Number of isomers possible for dichloro cyclohexane

    Number of possible isomers (8) 1, 2 dichloro cyclohexane 1, 3 dichloro cyclo hexane

    Home > English > Class 11 > Chemistry > Chapter > Isomerism >

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    Number of isomers possible for dichloro cyclohexane

    Updated On: 27-06-2022

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    Number of possible isomers (8) 1, 2 dichloro cyclohexane

    1, 3 dichloro cyclo hexane

    Answer

    Step by step solution by experts to help you in doubt clearance & scoring excellent marks in exams.

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    Cyclohexane on chlorination gives:

    Click here👆to get an answer to your question ✍️ TIT Number of isomers possible for dichloro cyclohexane 1) 8 2) 9 3 ) 6 4)7

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    TIT Number of isomers possible for dichloro cyclohexane 1) 8 2) 9 3 ) 6 4)7

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    Updated on : 2022-09-05

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