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Q.

White phosphorus on reaction with concentrated NaOH solution in an inert atmosphere of CO2 gives phosphine and compound (X). (X) on acidification with HCl gives compound (Y). The basicity of compound (Y) is:

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a

2

b

1

c

3

d

4

answer is C.

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Detailed Solution

P4+3NaOH+3H2O→3NaH2PO2+PH3

NaH2PO2+HCl→NaCl+H3PO2

H3PO2is mono basic and as it contain only one – OH group.

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