The reaction
`C_(6) H_(5) CHO + CH_(3) CHO rarr C_(6) H_(5) CH = CH - CHO` is known as

The reaction C_6H_5CHO + CH_3 CHO overset(NaOH) rarr C_6H_5-CH=CH-CHO+H_2O is known as

C_(6)H_(5)CHO + HCN rarr C_(6)H_(5)CH(CN)OH . The product would be

Arrange the following compound in increasing order of reactivity towards nucleophilic addition reaction (I) C_(6)H_(5)COCH_(3) (II) CH_(3)CO - C_(2)H_(5) C_(6)H_(5)CHO (IV) CI - CH_(2) - CHO