For each pair determine which is the better acid (lower pKa) at the alpha hydrogen.   Pair 1: [ Select ] CH3COCH2COCH3 - 2,4-pentanedione CH3COCH2CH2CH3 - 2-pentanone they're the same cannot tell   Pair 2: [ Select ] CH3COCH2CH2CH3 - 2-pentanone CH3CH2CH2CH2CH2CHO - pentanal they're the same cannot tell   Pair 3: [ Select ] CH3OCOCH2COOCH3 dimethyl malonate (beta-diester) CH3COCH2COCH3 - 2,4-pentanedione they are the same cannot tell多重下拉选择题

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