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Convert the following: `overset(?)rarr(B)overset(?)rarr(C)overset(?)rarr(D) underset((E))("Hept-2-yne")` 1-Bromopropane (A)

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Convert the following:
image `overset(?)rarr(B)overset(?)rarr(C)overset(?)rarr(D) underset((E))("Hept-2-yne")`
1-Bromopropane (A)
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Write the structure of (E) .
image
First prepare 3C-atom alkyne `(Me-C-=C-H)` from (A) and then react `4C`-atom RX with alkynide ion to get (E).
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