Match the compounds in column I with their characteristics/test(s)/reagents(s)/stereochemistry given in column II. Matching can be one or more than one.

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Solution

The reagent A is $F e {C l}_{2}$
2 moles of cyclopentadine reacts with one mole of ferrous chloride to form one mole of ferrocene.
Phenyl magnesium bromid reacts with oxygen to form phenol.
$2 P h M g B r (i) R e a g e n t A - -------- \to (i i) H_{3} O^{+} 2 P b O H$
Thus, the reagent A is oxygen, $O_{2}$
Phenyl magnesium bromide reacts with oxygen at low temperature followed by acidification to form benzoic acid.
$p H M g B r (i) R e a g e n t A a t - 70^{o} C - ------------------ \to {(i i) H}_{3} O^{\oplus} P b C O O H$
Thus, the reagent A is oxygen, $O_{2}$ .
When tert butyl bromide is heated with neopentane, neopentane is obtained.
Thus, the reagent A is dimethyl zinc.
${M e}_{2} Z n$
When ethyl magnesium bromide is heated with a mixture of $C o C l_{2}$ and ethyl tosylate, butane is obtained.
$C_{2} H_{5} M g B r Δ - ------- \to R e a g e n t A B u t a n e$
Thus, the reagent A is a mixture of $C o {C l}_{2}$ and $E t - O T s$ .

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Column I	Column II
Reaction	Product and name of the reaction