A researcher studying organic compounds has found that five different molecules - T, W, X, Y and Z-form chains According to the following rules :
i) A chain consists of three or more molecules, though the molecules in the chain are not necessarily different.
ii) T is never found on either end of a chain.
iii) If W appears in a chain, it appears more than once.
iv) X is never found next to Y in a chain.
v) W is never found on the end of a chain unless Z is found somewhere in the chain.
vi) If Y appears in a chain, Z appears also.
Which of the following is NOT a possible chain of molecules?

Options

A. X X T Z
B. Z X W W Z
C. W W W Z X
D. Y W T Z X X

Answer

D

Explanation

This is the mirror image of the problem above. Four of the five sequences are acceptable chain one is not. Just screen each choice with the initial conditions. The one sequence that is not acceptable is (5), because W appears only once.