InterviewSolution
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InterviewSolution
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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 hasA. no `- OH` groupB. one `- OH` groupC. three `- OH` groupsD. teo `- OH` groups |
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Answer» Correct Answer - D `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` |
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