Arrange the given words in the sequence in which they occur in the dictionary.
i. Catadrome
ii. Catagenesis
iii. Catabolic
iv. Catabolism

Let's arrange the words alphabetically by comparing their letters step-by-step:
All words start with "Cata-". Let's check the 5
th
letter onwards:

i. Catadrome

ii. Catagenesis

iii. Catabolic

iv. Catabolism

Comparing the 5
th
letters: 'b' comes before 'd' and 'g'. So, words starting with "Catab-" come first.

Between iii (Catabolic) and iv (Catabolism): up to the 8
th
letter "Catabol" they are identical. The 9
th
letter is 'i' in Catabolic and 'i' in Catabolism. The 10
th
letter is 'c' in Catabolic and 's' in Catabolism. Since 'c' comes before 's', iii precedes iv.

Sequence: iii, iv
Next, we compare i (Catadrome) and ii (Catagenesis) by their 5
th
letters: 'd' comes before 'g', so i precedes ii.

Final Sequence: iii, iv, i, ii
Therefore, the correct arrangement is iii, iv, i, ii.