Question

A compound with molecular formula $C_8{H}_{18}{O}_4$ does not give litmus test and does not give colour with $2,4$- DNP. It reacts with excess $MeCOCl$ to give a compound whose vapour density is $152$. Compound $A$ contains how many hydroxy groups ?

• A. $1$
• B. $2$
• C. $3$
• D. $4$

Answer 1

Answer: (C)

$3$

$C_8{H}_{18}{O}_4$ does not give litmus test and does not give colour with $2,4$- DNP.
Hence, carboxylic group and carbonyl group are absent.
$Molecularweight=2\times vapourdensity=2\times 152=304$

This is possible for the molecular formula $C_8{H}_{15}{O}_4(C{H}_{3}CO{)}_3=C_8{H}_{15}{O}_4{C}_3{H}_9{C}_3{O}_3$.
Thus $3OH$ groups are present.