3. Circle the correct answer (2 points each) A. All of the following represent o

Question

3. Circle the correct answer (2 points each) A. All of the following represent oxidation of the substrate, except for Bromination of alkenes Epoxidation of alkenes lorination of alkanes Reaction of alkynes with Li/NH B. All of the following molecules have the same number of carbons, which one is the least oxidized? NCCH3 C. Which of the following is not a good solvent for Sy2 reactions? CH3CN HMPA DMF CH3CO2 D. Which of the following is the worst leaving group for Sy2 reactions? Cl E. Which of the following is the least stable carbocation,- Primary allylic Isopropyl Secondary benzylic Primary vinylic

Explanation / Answer

Ans 3 :

A) Reaction of alkynes with Li/NH3

Li/NH3 is a strong reducing agent that causes the reduction of the substrate.

B) Ethene

The molecule has maximum number of hydrogen atoms , so it is most reduced and least oxidised.

C) CH3CO2H

The polar aprotic solvents favour SN2 reactions best.

D) F-

Since it is the smallest of all the halogens , with maximum bond dissociation energy.

E) Primary vinylic

The sp hybridised carbon becomes positively charged because of vinyl cation , which is closer to the positively charged nucleus , due to which cation becomes unstable.

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