CANADA STOCKS-TSX sheds 2.4 pct as energy sector gets pounded

* TSX falls 342.78 points, or 2.41 percent, to end at 13,852.95 * All of 10 main index sectors decline * Energy shares tumble 5.5 percent By John Tilak TORONTO, Dec 10 (Reuters) - Canada's main stock index on Wednesday posted its biggest single-day percentage drop in about 18 months as fears about sliding oil demand hit the commodity price and shares of energy producers. The selloff in the price of oil has begun to hurt sentiment for the broader equity market. The benchmark