The number of carboxylic acid with the formula `C_5H_(10)O_2` exhibiting constitutional isomerism is

The number of carboxylic esters with the formula C_5H_(10)O_2 exhibiting constitutional isomerism is

Total number of ethers possible with the molecular formula C_5H_(12)O exhibiting constitutional isomerism is

Total number of ethers possible with the molecular formula C_5H_(12)O exhibiting constitutional isomerism is

The total number of amines with molecular formula C_3H_8N exhibiting constitutional isomerism is

The number of ketones with the formula C_(5)H_(10)O is

Number of isomeric benzoic acids with formula C_8 H_8 O_2 is