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The synthesis of higher alkyne from lower alkyne is achieved by adding a bromo alkane in to a mixture of Sodium amide and an alkyne. Which of the following combination(s) of bromo alkane and alkyne, can lead to the formation of 3 – Octyne.

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1 – brom pentane and propyne

1 – bromo butane and butyne – 2

1 – bromo butane and butyne – 1

bromoethane and Hexyne – 1

answer is C, D.

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Detailed Solution

The above reaction is possible only with terminal (acidic) alkynes. Hence option “b” is not correct as it is non-terminal alkyne

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