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(B) The iodoform test is given by compounds containing the $CH_3CO-$ group or compounds that can be oxidized to this group. Treatment of $CH_3-CH_2-CC

Vedclass · Accepted Answer

$CH_3-CH_2-CCl_2-CH_3$

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(B) The iodoform test is given by compounds containing the $CH_3CO-$ group or compounds that can be oxidized to this group. Treatment of $CH_3-CH_2-CCl_2-CH_3$ with aqueous $KOH$ leads to the hydrolysis of the gem-dichloride to a gem-diol $(CH_3-CH_2-C(OH)_2-CH_3)$,which is unstable and loses a water molecule to form butan$-2-$one $(CH_3-CH_2-CO-CH_3)$. Butan$-2-$one contains the $CH_3CO-$ group,which reacts with potassium hypoiodite $(KOI)$ to form iodoform $(CHI_3)$,a yellow precipitate. Thus,the correct compound is $CH_3-CH_2-CCl_2-CH_3$.

Reactants	Products
$A$. $C_2H_5Cl$,moist $Ag_2O$	$I$. $CH_3CH_2ONO$
$B$. $C_2H_5Cl$,aqueous ethanolic $AgCN$	$II$. $C_2H_4$
$C$. $C_2H_5Cl$,aqueous ethanolic $AgNO_2$	$III$. $CH_3CH_2OH$
$D$. $C_2H_5Cl$,ethanolic $KOH$	$IV$. $CH_3CH_2NC$

Which of the following compounds can give a positive iodoform test when treated with aqueous $KOH$ solution followed by potassium hypoiodite?

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Match the following:
Reactants Products
$A$. $C_2H_5Cl$,moist $Ag_2O$ $I$. $CH_3CH_2ONO$
$B$. $C_2H_5Cl$,aqueous ethanolic $AgCN$ $II$. $C_2H_4$
$C$. $C_2H_5Cl$,aqueous ethanolic $AgNO_2$ $III$. $CH_3CH_2OH$
$D$. $C_2H_5Cl$,ethanolic $KOH$ $IV$. $CH_3CH_2NC$

The correct match is:

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