Geraldine Straus, the eldest daughter of William Coors, head of the Colorado brewing company, plunged 11 stories to her death from an apartment window in an apparent suicide, police said today. Mrs. Straus, 40, jumped Friday from the window of apartment 11C at 131 E. 23rd St. 'for no apparent reason,' a brief New York City police report said. She was rushed to a hospital after the 2 p.m. leap and pronounced dead at the facility, a police spokeswoman said. The dead woman's husband, Oscar Straus III, was at the hospital, the spokeswoman said. Mrs. Straus was Coors' daughter by his first wife, who is deceased. The dead woman has two sisters, May Louise Atre of San Luis Obiso, Calif., and Margret Beresford of Providence, R.I.