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(B) $CrO_3$ in pyridine (Sarett reagent) is a mild oxidizing agent. It oxidizes primary alcohols to aldehydes and secondary alcohols to ketones,but it

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$CH_3-C(=O)-CH_2-CHO$

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(B) $CrO_3$ in pyridine (Sarett reagent) is a mild oxidizing agent. It oxidizes primary alcohols to aldehydes and secondary alcohols to ketones,but it does not further oxidize aldehydes to carboxylic acids. In the given substrate $CH_3-CH(OH)-CH_2-CH_2-OH$,the primary alcohol group $(-CH_2OH)$ is oxidized to an aldehyde $(-CHO)$ and the secondary alcohol group $(-CH(OH)-)$ is oxidized to a ketone $(-C(=O)-)$. The reaction is: $CH_3-CH(OH)-CH_2-CH_2-OH \xrightarrow{CrO_3/Py} CH_3-C(=O)-CH_2-CHO$

What is the major product of the following reaction?
$CH_3-CH(OH)-CH_2-CH_2-OH \xrightarrow[Pyridine, \text{cold}]{CrO_3} \text{Product}$

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What is the major product of the following reaction? $CH_3-CH(OH)-CH_2-CH_2-OH \xrightarrow[Pyridine, \text{cold}]{CrO_3} \text{Product}$