In the following reaction sequence, X and Z respectively are :

1. A. X = POCl3 ; Z = CH3 - Br | CH - CH3
2. B. X = POCl3 ; Z = CH3CH2CH2-Br
3. C. X = H3PO3 ; Z = CH3 - Br | CH - CH3
4. D. X = H3PO3 ; Z = CH3CH2CH2-Br

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