A polyhydroxy compund $P (M o l a r w e i g h t = 92 g m / m o l)$ when heated with oxalic acid at $110^{\circ} C,$ forms a carboxylic acid which is found in ant bodies. When the same compound $P$ is heated with oxalic acid at or above $260^{\circ} C,$ a compound $Q$ along with gas $G$ which turns lime water milky and a liquid $L$ which turns anhydrous $C u S O_{4}$ blue are formed. What is vapour density of $Q$ ?

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Solution

$The carboxylic acid found in ant bodies is Formic acid . So, P + C_{2} H_{2} O_{4} 110^{o} C - -- \to HCOOH Gas wich turns lime water milky is {CO}_{2} . P + C_{2} H_{2} O_{4} 260^{o} C - -- \to Q + {CO}_{2} (g) + H_{2} O Therefore P = Glycerol (C_{3} H_{8} O_{3}) Q = Allyl alcohol or propenol (C_{3} H_{6} O) So, molar mass of Q = 58 vapour density of Q = 29$

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