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Name the process which may be used to lo...

Name the process which may be used to locate the position of a triple bond.

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To locate the position of a triple bond in a hydrocarbon, we can use a process called **ozonolysis**. Here’s a step-by-step explanation of how this process works: ### Step-by-Step Solution: 1. **Understanding Ozonolysis**: Ozonolysis is a chemical reaction where ozone (O3) is used to cleave double or triple bonds in alkenes and alkynes. This reaction helps in identifying the structure of the compound by breaking it down into smaller components. 2. **Example Hydrocarbon**: Consider the example hydrocarbon: CH3-C≡C-CH2-CH3. This compound contains a triple bond between the second and third carbon atoms. 3. **Reaction with Ozone**: When this hydrocarbon is treated with ozone (O3), it forms an intermediate known as an ozonide. The ozonide is a product of the reaction where the ozone adds across the triple bond. 4. **Reduction of Ozonide**: The ozonide can then be reduced using zinc and acetic acid (or water), which leads to the cleavage of the ozonide and the formation of carbonyl compounds. 5. **Formation of Acids**: In this specific example, the ozonolysis of the triple bond results in the formation of two moles of carboxylic acids. The structure of these acids can provide information about the original hydrocarbon. 6. **Identifying the Position of the Triple Bond**: By analyzing the two resulting acids, we can deduce the original structure of the hydrocarbon. The positions of the groups in the acids indicate where the triple bond was located in the original compound. 7. **Conclusion**: Therefore, the process used to locate the position of a triple bond is called **ozonolysis**.
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Lemieux reagent consist of an aqueous solution of sodium periodate (NaIO_(4)) and a trace of KMnO_(4) It is used for locating the position of double bond in an alkene. During the reaction, the alkene is first oxidised to cis-diol which upon cleavage with sodium peroxide gives aldehydes and ketones (similar to ozonolysis). Hot solution of acidic or alkaline KMnO_(4) can also be used for locating double bond by observing the products which are ketones or carboxylic acids. Position of triple bond can be identified by similar process. An alkene on treatment with NaIO_(4) , KMnO_(4) "and" Na_(2)O_(2) gives acetone and acetaldehyde. The alkene is :

MODERN PUBLICATION-HYDROCARBONS-PRACTICE PROBLEMS
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  2. How will propene react with HBr (i) in the presence of peroxide (ii) i...

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  3. Name two tests to test the presence of double bond in a compound.

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  4. Name an alkene which on reductive ozonolysis produces only acetone.

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  5. Complete the reaction : CH(2)=CH(2) overset("alk." KMnO(4)) to

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  6. Complete the reaction:

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  7. How will you prepare acetaldehyde from acetylene ?

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  8. Which of the following alkynes react with sodium in liquid ammonia ? ...

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  10. Which of the following is most acidic (i) Butane (ii) But-1-ene (ii...

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  12. Name the reagent X' in the reaction : 1,2-"Dibromoethane" overset(X...

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  13. Write chemical equation for the combustion of hexyne.

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  14. Complete the reaction : C(6)H(6) overset(O(3))toA overset(Zn, H(2...

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  15. Complete the reaction : B overset(MnO(2),H^(+))to C(6)H(5)CH(3) und...

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  16. What is difference between alkylation and acylation ?

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  17. What is halogen carrier ? Give one example.

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  18. What is Huckel rule ?

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