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Q.

Which of the following will give(H₃PO₃ )phosphonic acid on reacting with PCl₃ ?

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a

CH₃COOH

b

CH₃CH₂OH

c

HOH

d

All of these

answer is D.

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Detailed Solution

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$3 {CH}_{3} COOH + PC l_{3} \overset{}{\to} 3 {CH}_{3} COCl + H_{2} {PO}_{3}$

$3 {CH}_{3} {CH}_{2} OH + PC l_{3} \overset{}{\to} 3 C_{2} H_{5} Cl + H_{3} {PO}_{3}$

3HOH + PCl₃ $\overset{}{\to}$ 3HCl + H₃PO₃

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