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In the following questions, a statement ...

In the following questions, a statement of assertion (A) is following by a statement of reason (R )
A : Meso -2, 3 - dibromobutane on reaction with Zn/ether gives trans but -2 ene .
R : Zn/ether gives anti elimination .

A

If both Assertion & Reason are the reason is the correct explanation of the assertion, then mark (1).

B

If both Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark(2).

C

If Assertion is true statement but Reason is false , then mark (3)

D

If both Assertion and Reason are false statements, then mark (4)

Text Solution

AI Generated Solution

The correct Answer is:
To solve the assertion-reason question, we need to analyze both statements step by step. ### Step 1: Understand the Assertion **Assertion (A):** Meso-2,3-dibromobutane on reaction with Zn/ether gives trans-but-2-ene. - Meso-2,3-dibromobutane is a compound that has two bromine atoms attached to the second and third carbon atoms of a butane chain. - It is a meso compound, which means it is optically inactive due to its internal plane of symmetry. - When meso-2,3-dibromobutane is treated with Zn in ether, it undergoes elimination to form an alkene. ### Step 2: Understand the Reaction Mechanism - The reaction involves the elimination of bromine atoms from the meso compound. - The elimination occurs in such a way that the two bromine atoms are removed from opposite sides of the molecule (anti-elimination). - This results in the formation of a double bond between the second and third carbon atoms, yielding trans-but-2-ene. ### Step 3: Understand the Reason **Reason (R):** Zn/ether gives anti-elimination. - Anti-elimination refers to the mechanism where leaving groups (in this case, bromine atoms) are removed from opposite sides of the molecule. - This is a characteristic of elimination reactions facilitated by zinc in ether, leading to the formation of trans alkenes. ### Step 4: Evaluate the Truth of Both Statements - Both the assertion and reason are true. - The assertion correctly states the product formed from the reaction, and the reason accurately describes the mechanism involved. ### Conclusion - Since both the assertion and reason are true, and the reason correctly explains the assertion, we conclude that the assertion is correct and the reason is a valid explanation. ### Final Answer Both Assertion (A) and Reason (R) are true, and R is the correct explanation of A. ---
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