In Mozingo reaction the reagent used is

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$H S - C H_{2} - C H_{2} - S H$

$H S - C H_{2} - C H_{2} - O H$

$H - C H_{2} - C H_{2} - S H$

$H O - C H_{2} - C H_{2} - O H$

answer is A.

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Detailed Solution

Explanation:

In the Mozingo reaction, the reagent used is HS-CH₂-CH₂-SH (ethane-1,2-dithiol). This reaction is a type of thiol addition reaction, where a thiol group (-SH) is added to a carbon-carbon double bond.

The thiol group is important for forming new sulfur-containing bonds in the reaction mechanism, and HS-CH₂-CH₂-SH provides the required sulfur atoms to participate in the reaction.

The other options, such as HS-CH₂-CH₂-OH, H-CH₂-CH₂-SH, and HO-CH₂-CH₂-OH, are incorrect because they either contain alcohol (-OH) groups or lack the necessary structure for the thiol addition to take place as in the Mozingo reaction.

Final Answer

The correct answer is HS-CH₂-CH₂-SH.

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