1.

The compound C_(4)H_(10)O_(4) reacts with acetic anhydride to give a derivative with the formula C_(12)H_(18)O_(8). How many (OH) groups are present in the original substance

Answer»

2
3
7
4

Solution :M. mass of compound
`= 4 XX 12 + 10 xx 4 xx 6 = 122`
M. mass of polyacetate
`=12 xx 12 + 18 xx 16 = 290`
`:.` No. of OH GROUP `= (290-122)/(42) = 4`


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