Trapezoids are not considered parallelograms because parallelograms have 2 pairs of parallel sides, whereas trapezoids have only one.
Some definitions of trapezoid say "at least one pair of parallel sides" in which case, some trapezoids would be parallelograms (the ones that have 2 pairs of parallel sides), but most textbooks in the US now define trapezoids as "exactly one pair of parallel sides."
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they are not congruent
No because trapezoids have different properties to that of parallelograms but they are both 4 sided quadrilaterals.
No but they are both 4 sided quadrilaterals.
Yes.
Trapezoids have only one pair of parallel sides. A parallelogram has two pair of parallel sides.