Based on conference talks of the last several decades, the following are the most popular, that is most cited, chapters in the Book of Mormon:
2 Nephi 2 (522 citations)
Moroni 10 (400 citations)
Moroni 7 (399 citations)
3 Nephi 11 (369 citations)
2 Nephi 9 (339 citations)
Alma 34 (332 citations)
Alma 5 (330 citations)
3 Nephi 27 (314 citations)
Mosiah 3 (305 citations)
Mosiah 4 (301 citations)
2 Nephi 31 (281 citations)
2 Nephi 28 (244 citations)
Mosiah 18 (233 citations)
Mosiah 2 (227 citations)
Ether 12 (220 citations)
Alma 42 (209 citations)
If, looking over the list, you cannot remember why a particular chapter is on this list, perhaps it is time to refresh your memory.