Question

Complete the following reactions:
(i) $C_2{H}_{5}I+H_2\underset{C_2{H}_{5}OH}{\overset{Zn-Cu}{\to }}X$
(ii) $C{H}_{3}COONa+H_{2}O\underset{}{\overset{Electrolysis}{\to }}Y$
(iii) $C{H}_{3}C{H}_{2}C{H}_{2}C{H}_{2}C{H}_{2}C{H}_3\underset{773K}{\overset{C{r}_2{O}_3/A{l}_2{O}_3}{\to }}Z$

• A. $X=C_2{H}_6,Y=C_2{H}_6,Z=C_6{H}_6$
• B. $X=C{H}_4,Y=C{H}_{3}COOH,Z=C{H}_{3}C{H}_3$
• C. $X=C_2{H}_6,Y=C{H}_4,Z=C_4{H}_{10}$
• D. $X=C_2{H}_6,Y=C{H}_4,Z=C_5{H}_{10}$

Answer 1

Answer: (A)

$X=C_2{H}_6,Y=C_2{H}_6,Z=C_6{H}_6$

Answer:-

(i) Alkyl halides on reduction with hydrogen forms alkane of same no. of carbons present in alkyl halide.

$C_2{H}_{5}I+H_2\underset{C_2{H}_{5}OH}{\overset{Zn-Cu}{\to }}\underset{X}{C_2{H}_6}+HI$

(ii) Sodium acetate, on electrolysis, gives ethane. (Kolbe's electrolysis method)

$\underset{\text{Sodium acetate}}{{2C{H}_{3}COO}^{-}{Na}^{+}}+H_{2}O\stackrel{Electrolysis}{\to }\underset{\text{At anode}}{\underset{Y}{C{H}_{3}C{H}_3}}+\underset{\text{At cathode}}{H_2}$

(iii) The reaction is known as synthesis of benzene from hexane.

$C_6{H}_{14}\underset{773K}{\overset{{Cr}_2{O}_3/{Al}_2{O}_3}{\to }}\underset{Z}{\underset{Benzene}{C_6{H}_6}}$