[HK stocks jump by most in 7 weeks as Alibaba, tech index rebound while Chinese Estates soars on privatisation bid] Hong Kong stocks surged by the most in nearly seven weeks as Alibaba Group Holding paced a rebound in tech stocks from an all-time low. Chinese Estates Holdings surged on a take-private offer from its controlling shareholder. The Hang Seng Index rose 2.4 per cent to 24,543.19 as of noon local time for its biggest one-day rally since a 2.5 per cent gain on August 24. The Hang Seng Tech Index soared 4.3 per cent, poised for its best day...