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Explain the formation of products (B), (...

Explain the formation of products (B), (C), and (D) in the following reaction.

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Two moles of a very strong base, such as butyl lithium `(BuLi)`, convert an alkyne into dianion by the removal of the terminal H and a propargylic H.

Propargylic H is acidic due to resonance stabilisation (extended delocalisation) of the negative charge, as shown:

Moreover, due to the `sp` hybrid character of triple-bonded C, alkyne group `(-C-=C-R)` is EWG (electron withdrawing) and therefore is acid strengthening.
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