Identify product [A], [B] and [C] in the following reaction sequence. [2025]

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Q.
Identify product [A], [B] and [C] in the following reaction sequence. [2025]

${CH}_{3} - C \equiv CH \to_{H_{2}}^{Pd / C} [A] \to_{(ii) Zn, H_{2} O}^{(i) O_{3}} [B] + [C]$

1 $[A] : {CH}_{3} {CH}_{2} {CH}_{3}, [B] : {CH}_{3} CHO, [C] : HCHO$

2 3 $[A] : {CH}_{3} - CH = {CH}_{2}, [B] : {CH}_{3} CHO, [C] : {CH}_{3} {CH}_{2} OH$

4 $[A] : {CH}_{3} - CH = {CH}_{2}, [B] : {CH}_{3} CHO, [C] : HCHO$

Ans.
(4)

Catalytic hydrogenation of alkyne with Pd/C reduces an alkyne to alkane. To stop the reduction at alkene stage poison such as ${BaSO}_{4} / {CaCO}_{3}$ is needed. However in this question as per given choices, we need to stop the reduction upto alkene stage.

${CH}_{3} - C \equiv C - H + H_{2} \overset{Pd / C}{\to} {CH}_{3} - \underset{[A]}{CH} = {CH}_{2} \to_{(ii) Zn + H_{2} O}^{(i) O_{3}} {CH}_{3} \underset{[A]}{-} CHO + O \underset{[C]}{=} {CH}_{2}$

Solution

Q.
Identify product [A], [B] and [C] in the following reaction sequence. [2025]

${CH}_{3} - C \equiv CH \to_{H_{2}}^{Pd / C} [A] \to_{(ii) Zn, H_{2} O}^{(i) O_{3}} [B] + [C]$

1 $[A] : {CH}_{3} {CH}_{2} {CH}_{3}, [B] : {CH}_{3} CHO, [C] : HCHO$

2

3 $[A] : {CH}_{3} - CH = {CH}_{2}, [B] : {CH}_{3} CHO, [C] : {CH}_{3} {CH}_{2} OH$

4 $[A] : {CH}_{3} - CH = {CH}_{2}, [B] : {CH}_{3} CHO, [C] : HCHO$

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Solution

Q. Identify product [A], [B] and [C] in the following reaction sequence. [2025] CH3-C≡CH→H2Pd/C[A]→(ii)Zn,H2O(i)O3[B]+[C]

1 [A]:CH3CH2CH3,[B]:CH3CHO,[C]:HCHO

2

3 [A]:CH3-CH=CH2,[B]:CH3CHO,[C]:CH3CH2OH

4 [A]:CH3-CH=CH2,[B]:CH3CHO,[C]:HCHO

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Q.
Identify product [A], [B] and [C] in the following reaction sequence. [2025]

${CH}_{3} - C \equiv CH \to_{H_{2}}^{Pd / C} [A] \to_{(ii) Zn, H_{2} O}^{(i) O_{3}} [B] + [C]$

1 $[A] : {CH}_{3} {CH}_{2} {CH}_{3}, [B] : {CH}_{3} CHO, [C] : HCHO$

3 $[A] : {CH}_{3} - CH = {CH}_{2}, [B] : {CH}_{3} CHO, [C] : {CH}_{3} {CH}_{2} OH$

4 $[A] : {CH}_{3} - CH = {CH}_{2}, [B] : {CH}_{3} CHO, [C] : HCHO$