Which of the following organic compounds could not be dried by anhydrous $C a C l_{2}$ ?

Ethanol

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Benzene

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Chloroform

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Ethyl acetate

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Solution

The correct option is B Ethanol
Calcium chloride (n=6, e=1.5 mg/L) is a very good drying agent for a broad variety of solvents but is generally not compatible with hydroxy (alcohol, phenol), amino (amine, amide) and carbonyl (acid, ketone, ester) functions due to basic impurities such as Ca(OH)₂ and CaCl(OH).

Ethanol could not be dried by anhydrous $C a C l_{2}$ because it reacts with $C a C l_{2}$ as follows

$C a C l_{2} + 4 C_{2} H_{5} O H \to C a C l_{2} \cdot 4 C_{2} H_{5} O H s o l i d$

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Similar questions

Ethyl alcohol cannot be dried by anhydrous CaCl₂ because

{C a C l}_{2}, {C u S O}_{4} .5 H_{2} {O, N a}_{2} {C O}_{3} . {10 H}_{2} O

{C a C l}_{2}, {C u S O}_{4}, 5 H_{2} {O, N a}_{2} {C O}_{3} {10 H}_{2} O

{C a C l}_{2}, {C u S O}_{4} . 5 H_{2} {O, N a}_{2} {C O}_{3} . {10 H}_{2} O

C a C l_{2}

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