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Q.

When a mixture containing PCl3 and PCl5 is heated with ethyl alcohol, a total of 4 moles of ethyl chloride is formed. Mole ratio of PCl3 and PCl5 in the mixture is
 

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a

3 : 1

b

1 : 3 

c

 2 : 1

d

 1 : 1 

answer is B.

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Detailed Solution

3C2​H5​OH+PCl3​→3C2​H5​Cl+H3​PO3​  

C2​H5​OH+PCl5​→C2​H5​Cl+POCl3​+HCl
These are the reaction mole ratio of PCl3 and PCl5 of 1: 1

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