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Higher Alkynes from Alkynes

Statement: Wh...

Question

$S t a t e m e n t$ : When 2-butyne reacts with triethylamine followed by $B r_{2}$ then meso-2,3-dibromobutane is produced.
If the statement is true enter 1, else enter 0.

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Solution

2-butyne is partially reduced with sodium in liquid ammonia to obtain 2-butene. A molecule of bromine is then added across a carbon-carbon double bond to obtain meso-2,3-dibromobutane.
Hence, the given statement is $f a l s e$ .

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S t a t e m e n t

: Action of sodium in liquid

N H_{3}

B r_{2} / C C l_{4}

on 2-butyne produces meso-2,3-dibromobutane.
If the given statement is true then enter 1, if false enter 0.

S t a t e m e n t

: Cyclopentadecene reacts with

B r_{2} / C C l_{4}

N a N H_{2}

to give cyclopentadecyne

If the statement is true enter 1, else enter 0.

S t a t e m e n t

H_{2} / L i n d l a r^{'} s

catalyst followed by

B r_{2} / C C l_{4}

on 2-butyne produces a pair of diastereomers of 2,3-dibromobutane.
If the given statement is true the enter 1 if false enter 0.

S t a t e m e n t

: 2-butyne reaccts with one equivalent of

B r_{2}

C C l_{4}

to produce cis-2,3-dibromo-2-butene.
If true enter 1, if false enter 0.

Statement : X e F_{2}

[X e F] [A s F_{6}]

complex when reacts with

A s F_{5}

If true enter 1, else enter 0.

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