Question

QUESTION 1 The reaction of butanoic acid with bromine in the presence of phosphorus tribromide followed by addition of water yields which product? 2,3-dibromobutanoic acid 3-chlorobutanoic acid C2-bromobutanoic acid C 2-chlorobutanoic acid QUESTION 2 What is the relationship between keto and enol tautomers? Cresonance forms stereoisomers constitutional isomers different conformations of the same compound QUESTION 3 The reaction of cyclohexanone with LDA followed by allylbromide gives which product? C2-allylcyclohexanone C1-allylcyclohexanol C3-allylcyclohexanone C2-lithium diisopropylamidecyclohexanone

Answer 1

Question 1.

Ans: 2-bromobutanoic acid

This is known as Hell–Volhard–Zelinsky reaction in which we will get alpha halo acid.

Question 2.

Ans: Constitution isomers

Tautomers are having same molecular formula but different structure so they are constitutional isomers.

Question 3.

Ans: 2-allylcyclohexanone

Reaction of Cyclohexanone with LDA we will get enole and which will attack allylbromide to get 2-allylcyclohexanone.