Falling for the third straight session, the Sensex at the Bombay Stock Exchange closed with a huge loss of 454 points, or 2.3 percent, at 19,242, today, amid concerns about a liquidity crunch, and inflation, and on year-end selling by foreign funds. The Nifty at the National Stock Exchange fell 137 points, or 2.3 percent, to 5,767.But stock markets in Japan, Hong Kong, South Korea and Singapore rose between 0.2 percent and 1.7 percent.