justification 2 is incorrect.
since δabc is right angled at b, therefore by pythagoras theorem
we know that if two angles are similar, then the triangles are similar, so, statement 1 and 3 are correct.
if two triangles are similar, ratio of their corresponding sides are equal.
for example, if δdef δghi,
statement 4 satisfies this property but statement 2 does not satisfy this property.
hence, justification 2 is incorrect.