A comound with the molecular formula C_(4)H_(10)O_(3) is converted by the action of acetyl chloride into a compound with molecular mass 190. The original compound has

A comound with the molecular formula C_(4)H_(10)O_(3) is converted by

1.	A comound with the molecular formula C_(4)H_(10)O_(3) is converted by the action of acetyl chloride into a compound with molecular mass 190. The original compound has
Answer» no `- OH` GROUP one `- OH` group three `- OH` GROUPS teo `- OH` groups Solution :`RO-H+Cl-overset(O)overset(\|\|)(C )-CH_(3)overset(-HCl)(rarr)R-O-overset(O)overset(\|\|)(C )-CH-(3)` During the reaction of COMPOUND containing an `OH` group (such as alcohol) with acetyl chloride, the hydrogen atom (of `OH` group) is replaced by an acetyl group `(CH_(3)CO-)`. this results in net increases in molecular MASS by `42` units. `-H+CH_(3)-overset(O)overset(\|\|)(C )-rarr(-1)+(43)rarr42` Thus number of `OH` groups should be equal to the total increases in molecular mass divided by `42`. Molecular mass of compound before acetylation ltbRgt `=(12xx4+10xx1+16xx3)` `=106` Molecular mass of compound after acetylation=`190` `:.` No. of `OH` groups`=(190-106)/(42)=(84)/(42)=2`