1.

A Grignard reagent (A) and a haloalkene (B) react together to give (C). Compound (C) on heating with KOH yields a mixture of two geometrical isomers, (D) and (E), of which (D) predominates. (C) and (E) have the same molecular formula and (C) gives 1-bromo-3-phenyl propane on reaction with HBr in the presence of a peroxide. Give structures of (A), (B)and (C) and configuration of (D) and (E) with reasons.

Answer» <html><body><p></p>Solution :Since, (C) <a href="https://interviewquestions.tuteehub.com/tag/gives-1007647" style="font-weight:bold;" target="_blank" title="Click to know more about GIVES">GIVES</a> 1-bromo-3-phenylpropane on <a href="https://interviewquestions.tuteehub.com/tag/reaction-22747" style="font-weight:bold;" target="_blank" title="Click to know more about REACTION">REACTION</a> with HBr in the presence of a peroxide, therefore (C) is 3-phenylprop-1-ene. <br/> <img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/GRB_ORG_CHM_P2_S01_C17_018_S01.png" width="80%"/> <br/> Because (C) and (<a href="https://interviewquestions.tuteehub.com/tag/e-444102" style="font-weight:bold;" target="_blank" title="Click to know more about E">E</a>) have same <a href="https://interviewquestions.tuteehub.com/tag/molecular-562994" style="font-weight:bold;" target="_blank" title="Click to know more about MOLECULAR">MOLECULAR</a> formula, therefore, they are isomers and the reaction is : (C) `overset(<a href="https://interviewquestions.tuteehub.com/tag/koh-528424" style="font-weight:bold;" target="_blank" title="Click to know more about KOH">KOH</a>)to(D)+(E)` ,it is an isomerisation reaction. So, (D) and (E) are 3-phenylprop-2-ene. <br/> <img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/GRB_ORG_CHM_P2_S01_C17_018_S02.png" width="80%"/> <br/> Since, (C) is obtained by the reaction of a Grignard reagent (A) with haloalkene (B), therefore, (A)and (B) are: <br/> <img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/GRB_ORG_CHM_P2_S01_C17_018_S03.png" width="80%"/></body></html>


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