1.

Match the column :

Answer»

`{:("(P)","(Q)","(R)","(S)"),(1,"1,2",4,3):}`
`{:("(P)","(Q)","(R)","(S)"),("1,4","1,2","2,3,4",3):}`
`{:("(P)","(Q)","(R)","(S)"),(1,2,4,3):}`
`{:("(P)","(Q)","(R)","(S)"),("1,4","1,2,3","2,3,4",3):}`

Solution :Due to unsaturation brown colour of `Br_(2)//H_(2)O` decolourises. Carboxylic acid gives `CO_(2)` gas with `NaHCO_(3)` . Aldehydes gives BLACK or silver ppt. with TOLLEN's reagent and terminal alkynes gives white ppt. with tollen's reagent gtC=0 group gives POSITIVE 2,4-DNP test


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