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Distinguishing Test of Terminal and Non Terminal Alkynes

A Lindlar's C...

Question

$A L i n d l a r^{'} s \leftarrow ---- - Catalyst R - C \equiv C - R Birch reduction ⟶ B$
Where, A and B are geometrical isomers $(R - C H = C H - R)$ .
Choose the correct option from the following:

A

A is trans, B is cis

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B

A and B both are cis

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C

A and B both are trans

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D

A is cis, B is trans

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Solution

The correct option is D A is cis, B is trans
Birch reduction gives trans product and lindlar's catalyst gives cis. Hence correct option is (a).
Birch Reduction takes place in presence of $N a / l i q . N H_{3}$
Lindlar's catalyst is $H_{2}, P d / C$

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Similar questions

$B L i n d r a l / H_{2} \leftarrow ------ - R - C \equiv C - R N a / N H_{3} - ---- \to$ A and B are geometrical isomers (R - CH = CH - R):

A L i n d l a r^{'} s \leftarrow ---- - Catalyst R - C \equiv C - R Birch reduction ⟶ B

Where, A and B are geometrical isomers

(R - C H = C H - R)

.
Choose the correct option from the following:

$B L i n d r a l / H_{2} \leftarrow ------ - R - C \equiv C - R N a / N H_{3} - ---- \to$ A and B are geometrical isomers (R - CH = CH - R):

First, you name both the compounds. Yes, both of them have the same name. Yet, are they really the same structure, or they are somehow different? Careful inspection should convince you that they are indeed different. Now, how their physical and chemical properties differ? Generally,
i) Cis-isomer has more dipole moment than trans-isomer.
ii) Cis is less stable than trans.
iii) The boiling points of cis isomers are more than those of trans isomers (remember boiling points are directly related to polarity which is determined by dipole moment).
iv) Chemical reactivities of cis and trans also differ from each other.

Which of the following compounds exhibit geometrical isomerism?

C H_{2} - C H = C H_{3}

C H_{3} - C H = C H - C H_{3}

C H_{3} - C H = C = C H - C H_{3}

C H_{3} - C H = C = C = C H - C H_{3}

Q. Select the correct statement for

[M (A B) b_{2} c d]

:

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Distinguishing Test of Terminal and Non Terminal Alkynes

Standard XII Chemistry

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