CHM 1240 1709 001.501 COMB Online teaching and learning resource from Cengage Le

Question

CHM 1240 1709 001.501 COMB Online teaching and learning resource from Cengage Le.. rences ery Quiz (graded) (Review Topics) NaOH HC-I H C-OH 2. 8% O-BHs a-Proton transfer d- ElectrohicS Nucleophilic 2req substitution h SN2 Nucleophilic substitution b= Lewis acid/base e-El Elimination c = Radical chain substitution f-E2 Elimination Identify the mechanism by which each of the reactions above proceeds from among the mechanisms listed. Use the letters a i for your answers. 1. 2. Submit Answer Retry Entire Group 9 more group attempts remaining

Explanation / Answer

1.

Its a substitution reaction. I is replaced by OH.
So, Nucleophilic substitution reaction.

Now, if it goes through carbocation intermediate then methyl carbocation (1o carbocation) will form, which is least stable. So, its not SN1 reaction.

Hence, the Oh will attack from the back side of I.

Answer is SN2 Nucleophilic substitution.

2.

There are lone pair of electrons on the oxygen atom of the tetrahydrofuran. And BH3 has vacant orbital to accomodate electrons (deficient of electron). So, tetrahydrofuran donates electrons and BH3 accepts electrons.

So, answer is Lewis acid/base.

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