Question

A compound 'x' is heated with $C_2{H}_{5}OH$ and $H_{2}S{O}_4$, the fumes produced burn with green flame. The compound 'X' is :

• A. $H_{3}B{O}_3$
• B. $N{a}_2{B}_4{O}_7.10H_{2}O$
• C. $K_{3}B{O}_3$
• D. none of these

Answer 1

Answer: (D)

none of these

When ehanol is heated with concentrated sulphuric acid at 443 K, dehydration takes place and ethene is formed. In this reaction concentrated sulphuric acid acts as a dehydrating agent.

The reaction is given by,

$C_2{H}_{5}OH+Conc.H_{2}S{O}_4$ $\to$ $C{H}_2=C{H}_2+H_{2}O$

Hence X is $C{H}_2=C{H}_2$

So option D is correct answer.