CREATE TABLE table_11246 ("Year" TEXT, "Title" TEXT, "US 100" TEXT, "US AC" TEXT, "Lead singer" TEXT, "Album" TEXT, "Label and cat#" TEXT)

What is the US 100 rank of Champlin's Chicago 19 album with a US AC of 1?
SELECT "US 100" FROM table_11246 WHERE "Lead singer" = 'champlin' AND "Album" = 'chicago 19' AND "US AC" = '1'
SELECT "US 100" FROM "table_11246" WHERE "Album" = 'chicago 19' AND "Lead singer" = 'champlin' AND "US AC" = '1'