Question

Correct statement(s) about reaction & related graph is/are:

• A. Only P is nucleophilic substitution product by $S_N2$ reaction mechanism
• B. Only R, S are elimination products by E2 reaction mechanism
• C. P, Q are nucleophilic substitutiton products by $S_N2$ reaction mechanism.

Answer 1

Answer: (A)

Only P is nucleophilic substitution product by SN2 reaction mechanism

Answer 2

The reaction of (S)-2-bromobutane with OH- at 80°C produces both SN2 and E2 products. SN2 leads to (R)-butan-2-ol (inversion of configuration). E2 leads to but-1-ene, cis-but-2-ene, and trans-but-2-ene. The potential energy diagram shows P as the most stable product with the lowest activation energy, followed by Q, R, and S in decreasing order of stability and increasing order of activation energy. This order aligns with (R)-butan-2-ol (P) being the most stable, followed by trans-but-2-ene (Q), cis-but-2-ene (R), and but-1-ene (S). Therefore, P is the only SN2 product, and Q, R, S are E2 products.