The conversion of ethylene to vinyl bromide can be accomplished by use of these reagents in the order indicated.

Question

Quizplus · Accepted Answer

The conversion of ethylene to vinyl bromide requires the addition of a bromine atom to one of the carbon atoms in ethylene, followed by substitution of the bromine atom with a vinyl group (-CH=CH2). The reagents that can accomplish this are a source of bromine atom (Br2 or HBr) and a source of the vinyl group (-CH=CH2) such as sodium ethoxide (NaOCH2CH3) or sodium acetylide (NaC2H). Option B contains the correct order of reagents to achieve this transformation, with the first step being the addition of a bromine atom using Br2, and the second step being the substitution of the bromine with the vinyl group using NaOCH2CH3. Option A is incorrect because NaOCS2H5 is not a source of the vinyl group (-CH=CH2). Option C is incorrect because the second step involves hydroxide ion, which is not a suitable nucleophile for substitution. Option D is incorrect because NaNH2 is a strong base and would deprotonate the HBr, leading to the formation of hydrogen gas. Option E is incorrect because SOCl2 is not a source of the vinyl group (-CH=CH2).

The Conversion of Ethylene to Vinyl Bromide Can Be Accomplished