Solution:
(i) It is known to us that a conditional statement is not logically equivalent to its converse.
Converse: If the triangle is equilateral, then all the 3 angles of the triangle are equal.
(ii) It is known to us that a conditional statement is not logically equivalent to its converse.
Converse: If $2x = 3y$ then $x: y = 3: 2$