Question

Match the reactions given in Column I with the suitable reagents given in Column II and choose the correct option from the codes given below.

Column I (Reactions)		Column II (Reagents)
A	Ethane nitrile to ethanal	1	$O _{3} / H _{2} O - Zn$ dust
B	Allyl alcohol to propanal	2	(DIBAL-H)
C	But-2-ene to ethanal	3	$PCC$

• A. A - (1) , B - (2 ),C - (3)
• B. A - (3) , B - ( 2),C - (1)
• C. A - (2) , B - (3 ),C - (1)
• D. A - (2) , B - (1 ),C - (3)

Answer 1

Answer: (C)

$A \rightarrow 2, B \rightarrow 3, C \rightarrow 1$
$\underset{\text{Ethane nitrile}}{CH _{3}- C \equiv N} \xrightarrow{\text { DlBAL-H }} \underset{\text{Ethanal}}{CH _{3} CHO}$
$\underset{\text{Allyl alcohol }}{CH _{2}== CH - CH _{2} OH} \xrightarrow{ PCC }\underset{\text{Propanal}}{CH _{3} CH _{2} CHO}$
$\underset{\text{But -2- ene}}{CH _{3}- CH == CH - CH _{3}} \xrightarrow[\text{Zn dust}]{ O _{3} / H _{2} O }\underset{\text{Ethanal}}{2 CH _{3} CHO}$