What is the major organic product that results when 1-heptyne is treated with 2 equivalents of hbr? question 10 options: 2,2-dibromoheptane 1,1-dibromoheptane 1,2-dibromoheptane 2,3-dibromo-1-heptene 2,3-dibromo-2-heptene

The major organic product is 2,2-dibromoheptane

Explanation:

At first, 1-heptyne is protonated by 1-equivalent HBr and produces a stable carbocation followed by nucleophilic attack by bromide ion.

Then another equivalent of HBr adds on double bond to produce another carbocation which is highly stable due to electron donating resonating effect of Br atom (+R effect). Thus a consequent nucleophilic attack onto that carbocation leads to formation of 2,2-dibromoheptane as a major product.

Detailed mechanism has been attached below.

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the dissolution of polymer can be thermodynamically described in 2 steps.