Yahoo! Inc. (YHOO) may rise 65 percent by the end of the year after Chinese e-commerce giant Alibaba Group Holding Ltd. goes public later this week, according to bets by structured-products buyers. Investors are piling into call warrant and knock-out certificates that pay a return if Yahoo’s share price climbs above a pre-defined level. Some are betting Yahoo will increase to as much as $70 by Dec. 29, according to data compiled by Bloomberg. “At the moment, Yahoo is one of the most common U.S.-based underlyings trading in Germany,” said Heiko Geiger, the Frankfurt-based head of public distribution of structured products for Germany and Austria at Bank Vontobel Europe AG.