Identify (X), (Y) and (Z) in the given r...

Identify (X), (Y) and (Z) in the given reaction.
`X+Y overset(Z)rarrunderset("3-Hydroxybutanal")(CH_(3)-overset(OH)overset(|)(CH)-CH_(2))-CHO`

`X-HCHO, Y - CH_(3)CHO, Z-KOH`

`X-CH_(3)CHO, Y-CH_(3)CHO, Z-NaOH`

`X-CH_(3)CH_(2)OH, Y-HCHO, Z-H_(2)SO_(4)`

`X-CH_(3)CH_(2)CHO, Y-HCHO, Z-"Dry ether"`

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Identify (A) in the given reactions sequence. (A) overset(O_(3)//H_(2)O)rarr (B) overset(Delta)rarr 2CH_(3)-overset(O)overset(||)(C)-CH_(3)-2CO_(2)

`{:(X,Y,Z),(C,Ni,(CH_(3))_(2)Si(OH)_(2)):}`

`{:(X,Y,Z),(Si,Zn,(CH_(3))_(2)SiCl_(2)):}`

`{:(X,Y,Z),(Si,Cu,(CH_(3))_(2)SiCl_(2)):}`

`{:(X,Y,Z),(H_(2)O,Si,(CH_(3))_(2)Si(OH)_(2)):}`

`X = H_(2)SO_(4), Y = H_(2)O // OH^(-), Z = PCl_(5)`, heat

`X = HNO_(3), Y = Na_(2)CO_(3), Z = H_(2)SO_(4)`, heat

`X = H_(2)SO_(4)//Hg^(2+), Y = PCl_(5)//H_(2)O, Z = K_(2)Cr_(2)O_(7)//OH^(-)`

`X = H_(2)SO_(4)//Hg^(2+), Y = CH_(3)MgBr//H_(2)O, Z = K_(2)Cr_(2)O_(7)//H^(+)`