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Order of Reaction

The reagent u...

Question

The reagent used for getting trans alkene from alkyl substituted acetylene with hydrogen is :

A

N a

in liq.

N H_{3}

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B

anhy.

A l C l_{3}

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C

Z n + H C l

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D

H_{2}

in presence of

N i

(or)

P t

(or)

P d

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Solution

The correct option is B $N a$ in liq. $N H_{3}$
For getting trans product, Na/liq. ammonia used as reducing agent.
Reaction:
$R C \equiv C R + H_{2} N a / N H_{3} o r L i A l H_{4} - ---------- \to R C H = R C H$ (trans alkene)

Option A is correct.

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Similar questions

Q. When alkyl disubstituted acetylene undergoes addition with hydrogen in presence of Lindlars catalyst, the alkene formed is:

P

Q

R

.
The possible reagents are:

2 N a

N H_{3}

H_{2} / P d / C a C O_{3}

(quinoline)
(III)

2 H_{2} / P d / C

The correct statement with respect to the above conversion is(are):

Q. Reduction of

C H_{3} C H_{2} N C

with hydrogen in presence of

N i

P t

as catalyst gives:

Q. Match the reactions from List-I with the catalyst or reagent used in them from List-II.

List-I	List-II
A) Sabatier Senderens reaction	1) Anhydrous $A l C l_{3}$
B) Friedel crafts reaction	2) $N i + H_{2}$
C) Wurtz reaction	3) Sodium acetate
D) Kolbe's electrolysis	4) $N a$ 5) $C H_{4}$

In the conversion of alkyne to trans-alkene by Birch reduction using alkali metals (such as Na or K) in liquid

N H_{3}

and alcohol (MeOH or EtOH).
the mechanism takes place in the formation of intermediate species in the following sequence

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