One of the most challenging aspects of learning organic chemistry is devising sequences of reactions that will lead from a designated starting compound to a desired product compound. This problem is an introduction to the planning of multistep syntheses. For use, you have six reactant compounds (A through F); and eight reagents (1 through 8), shown below.
Following these lists, five multistep syntheses are outlined. For each of these, certain reactants or reagents must be identified by entering an appropriate letter or number in designated answer boxes. Enter a single letter or number, indicating your choice of the best reactant or reagent, in each answer box.

Reactant Compounds:

Reagents

1   Jones' reagent   Na2Cr2O7 in H3O(+)	2   PCC   CrO3 in pyridine + HCl	3   Sodium Hydride   NaH	4   Sodium Borohydride   NaBH4
5   Thionyl Chloride   SOCl2	6   Phosphorus Tribromide   PBr3	7   Aluminum Trichloride   AlCl3	8   Magnesium   Mg turnings in ether

	1) reagent  2) Reactant 3)   H3O(+)	C9H12O2	reagent
Reactant	reagent	C3H6O2	1) reagent      2) Reactant +         reagent & heat
	1) reagent  2) reagent 3)   CO2       4)   H3O(+)	C6H10O2	Reactant heating with catalytic acid
Reactant	reagent	C3H6O	1) NaOH solution   2) reagent       3) Reactant
Reactant	1) reagent  2) reagent	C3H7Br	1) reagent  2) Reactant 3)   H3O(+)