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Question

In the following reaction identify compounds A,B,C and D :
PCl5+SO2A+B;
A+CH3COOHC+SO2+HCl
2C+(CH3)2CdD+CdCl2

A
SOCl2,POCl3,CH3COCl,CH3COCH3
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B
SOCl2,HCl,CH3Cl,CH3CHO
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C
SO2,Cl2,C2H5Cl,CH3COCH3
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D
None of these
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Solution

The correct option is A SOCl2,POCl3,CH3COCl,CH3COCH3
The compounds A,B,C and D are SOCl2,POCl3,CH3COCl,CH3COCH3 respectively.
The reactions are as shown below:
Phosphorous pentachloride reacts with sulphur dioxide to form thionyl chloride and phosphorous oxychloride.
PCl5+SO2SOCl2A+POCl3B

Thionyl chloride reacts with acetic acid to form acetyl chloride, sulphur dioxide and hydrogen chloride gas.
SOCl2A+CH3COOHCH3COClC+SO2+HCl
Acetyl chloride reacts with dimethyl cadmium to form acetone and cadmium (II) chloride.
2CH3COClC+(CH3)2Cd2CH3COCH3D+CdCl2

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