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Chapter 2: Problem 173

Directions: Each question contains Statement-1 and Statement-2 and has the following choices (a), (b), (c) and (d), out of which ONLY ONE is correct. (a) Statement- 1 is True, Statement- 2 is True; Statement- 2 is a correct explanation for Statement-1 (b) Statement- 1 is True, Statement- 2 is True; Statement- 2 is NOT a correct explanation for Statement-1 (c) Statement-1 is True, Statement- 2 is False (d) Statement- 1 is False, Statement- 2 is True Statement 1 Erythro-2,3-dibromobutane on reaction with zinc and alcohol gives trans 2 -butene. and Statement 2 Elimination requires trans periplanar geometry.

Short Answer

Expert verified
Question: Analyze the following two statements and determine the correct relationship between them: Statement 1: Erythro-2,3-dibromobutane on reaction with zinc and alcohol gives trans-2-butene. Statement 2: Elimination requires trans periplanar geometry. Answer: (a) Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1.

Step by step solution

01

Analyze Statement 1

First, we need to determine if erythro-2,3-dibromobutane reacts with zinc and alcohol to give trans-2-butene. It is essential to note that erythro-2,3-dibromobutane can undergo an anti-elimination reaction in the presence of zinc and alcohol. As a result, trans-2-butene will be formed. Hence, Statement 1 is true.
02

Analyze Statement 2

Now, we need to determine if the elimination requires a trans periplanar geometry. In general, elimination reactions follow an anti-periplanar geometry, meaning that the leaving groups or the hydrogen and halogen atoms are on opposite sides of the molecule. This alignment allows for the smooth flow of electrons during the elimination process. Thus, Statement 2 is also true.
03

Decide on the relationship between S1 and S2

Now that we know both statements are true, we need to decide whether S2 is a correct explanation for S1 or not. S1 represents the specific reaction of erythro-2,3-dibromobutane forming trans-2-butene, while S2 provides a general fact about elimination reactions requiring a trans periplanar orientation. Since anti-periplanar geometry is essential for the elimination mechanism happening in S1, we can say that S2 is a correct explanation for S1. Based on these steps, our answer is: (a) Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1.

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