Both X and Y are soame and are 1-methoxy-2-methylpropan-2-ol Both X and Y are soame and are 2-methoxy-2-methylpropan-1-ol X is 1-methoxy-2-methylpropan-2ol and Y is 2-methoxy-2-methylpropan-1-ol X is 2-methoxy-2-methylpropan-2-methylpropan-1-ol and Y is 1-methoxy-2-methylpropan-2-ol