Need help with 24. 23 shows how the problems are solved but i dont understand.

PROBLEM 23 SOLVED What are the major products obtained when the following ether is heated with one equivalent of HI? LI SOLUTION The reaction takes place by an SN2 pathway because neither alkyl group will form a relatively stable carbocation (one would be vinylic and the other primary). lodide ion attacks the carbon of the ethyl group because otherwise it would have to attack a vinylic carbon, and vinylic carbons are not attacked by nocleophiles (Section 9.13). Thus, the major products are ethyl iodide and an enol that immediately rear- aldehyde (Section 7.7). inges to an HI 4 OH We 00 H 86 PROBLEM 24 What are the major products obtained when each of the following ethers is heated with one equivalent of HI? c. e. OCH d. f. CH3 CH