Question

an organic liquid (A), containing C,H and O with boiling point ${78}^{\circ }$C and possessing a rather pleasant odour or heating with concenterated $H_{2}S{O}_4$ gives a gaseous product (B) with the empirical formula $C{H}_2$. B decolourises bromine water as well as alkaline $KMn{O}_4$ solution and takes up one mole of $H_2$(per mole of B) in the presence of finely divided nickle at high temperature. A and B are:

• A. $C_2{H}_{5}OH$, $C_2{H}_2$
• B. $C{H}_{3}OH$, $C_2{H}_2$
• C. $C_2{H}_{5}OH$, $C_2{H}_4$
• D. $(C{H}_3{)}_{2}CHOH$, $C_3{H}_6$

Answer 1

Answer: (C)

$C_2{H}_{5}OH$, $C_2{H}_4$

$C_2{H}_{5}OH$ or ethyl alcohol when treated with concentrated $H_{2}S{O}_4$ undergoes dehydration to form ethene($C_2{H}_4$). Ethane reacts with alkaline $KMn{O}_4$ undergoes oxidation to form ethylene glycol. Ethene undergoes hydrogenation in presence of nickel heads of one mole of $H_2$ to form ethane.

The correct option is C