If the double bond is broken heterolytically, formal charge pairs result, as shown in the other two structures. The preferred charge distribution will have the positive charge on the less electronegative atom (carbon) and the negative charge on the more electronegative atom (oxygen).
Single malt Scotch. Single malt Scotch is single malt whisky made in Scotland. To be a single malt scotch the whisky must have been distilled at a single distillery using a pot still distillation process and made from a mash of malted grain. In Scotland, the only grain allowed to be used in a single malt whisky is barley.
Malt whiskey is whiskey produced from grains that were 100% malted. This generally means that the mash bill was 100% barley. Scotch malt whisky is required by law to be 100% barley. Single malt whisky is a malt whisky produced at one distillery.