Question

Which of the following reactions can be used for the preparation of propane?

• A. $C{H}_{3}CH=C{H}_2\stackrel{1.B_2{H}_6}{\underset{2.C{H}_{3}COOH}{\to }}$
• B. $C{H}_{3}C{H}_{2}C{H}_{2}Cl\stackrel{1.Mg/ether}{\underset{2.H_{2}O}{\to }}$
• C. $C{H}_{3}C{H}_{2}C{H}_{2}I\stackrel{RedP/HI/{150}^{o}C}{\to }$
• D. $C{H}_{3}C{H}_{2}C{H}_{2}COONa\underset{\Delta }{\stackrel{NaOH/CaO}{\to }}$

Answer 1

Answer: (A), (B), (C), (D)

The correct options are
A $C{H}_{3}CH=C{H}_2\stackrel{1.B_2{H}_6}{\underset{2.C{H}_{3}COOH}{\to }}$
B $C{H}_{3}C{H}_{2}C{H}_{2}Cl\stackrel{1.Mg/ether}{\underset{2.H_{2}O}{\to }}$
C $C{H}_{3}C{H}_{2}C{H}_{2}COONa\underset{\Delta }{\stackrel{NaOH/CaO}{\to }}$
D $C{H}_{3}C{H}_{2}C{H}_{2}I\stackrel{RedP/HI/{150}^{o}C}{\to }$

Following can be used for the preparation of propane.
(A) Propene reacts with diborane and acetic acid to form propane.
$C{H}_{3}CH=C{H}_2\stackrel{1.B_2{H}_6}{\underset{2.C{H}_{3}COOH}{\to }}\underset{propane}{C{H}_{3}C{H}_{2}C{H}_3}$
(B) n propyl chloride reacts with propyl magnesium chloride followed by acidic hydrolysis to form propane.
$C{H}_{3}C{H}_{2}C{H}_{2}Cl\stackrel{1.Mg/ether}{\underset{2.H_{2}O}{\to }}\underset{propane}{C{H}_{3}C{H}_{2}C{H}_3}$
(C) n-propyl iodide is heated with a mixture of red phosphorus and HI at ${150}^{0}C$ to obtain propane.
$C{H}_{3}C{H}_{2}C{H}_{2}I\stackrel{RedP/HI/{150}^{o}C}{\to }\underset{propane}{C{H}_{3}C{H}_{2}C{H}_3}$
(D) Sodium salt of butanoic acid is heated with sodalime and CaO to obtain propane. This is decarboxylation reaction.
$C{H}_{3}C{H}_{2}C{H}_{2}COONa\underset{\Delta }{\stackrel{NaOH/CaO}{\to }}\underset{propane}{C{H}_{3}C{H}_{2}C{H}_3}$.