26) Describe the following reaction. 26) OH NaOH, H2Co H,C-CH-CH Br H3C-CH-CH2 A

Question

26) Describe the following reaction. 26) OH NaOH, H2Co H,C-CH-CH Br H3C-CH-CH2 A) SN2 reaction followed by an intramolecular Williamson ether synthesis B) acid-base reaction followed by an intramolecular Williamson ether synthesis. C) acid-base reaction followed by an intramolecular SN1 reaction. D) E2 reaction followed by an addition reaction to a double bond. 27) The role of 18-crown-6 in the reaction shown below is to 27) 18-crown-6, CHCH,CHCH,F + O. 18-crown-6 A) remove Br by ion-dipole attraction and shift the equilibrium to the products. B) complex F by ion-dipole attraction and make it more nucleophilic. O complex K+ by ion-dipole attraction increasing the solubility of KF and the nucleophilicity of F D) stabilize the carbocation in the substitution reaction.

Explanation / Answer

Ans 26 : B) acid - base reaction followed by an intramolecular williamson ether synthesis

The reactant shown in the question is abromohydrin which reacts with base , H2O to give epoxide. The reaction occurs in two steps. The first is an acid - base reaction , in which base deprotonates the alcohol. The seconds step is the SN2 reaction that gives the product as epoxide.

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