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4. IF two angles are congruent, they are right angles. FALSE>>>>>please check

CONVERSE: If two angles are right angles,then they are congruent angles.

Correct. The converse is true.

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5. If two angles form a linear pair, then they are supplementary.FALSE>>>>>please check

CONVERSE: iF two angles are supplementary, then the two angles (or they) form linear pair.

This page says that the original statement is true. Do you have a different definition? The converse is false.

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6. Two angles are each acute if they are complementary.TRUE>>>>>please check

CONVERSE: Two angles are complementary angles, if they are acute....

please try to check my work

Correct. The converse is false.