Arrange the following words in the same order in which they occur in dictionary.
1. Acorn
2. Acoustic
3. Acquaint
4. Acquired
5. Aconitine

Given: 1. Acorn 2. Acoustic 3. Acquaint 4. Acquired 5. Aconitine

All words begin with "Ac".

Now let’s compare them alphabetically:

Aconitine — “Acon”

Acorn — “Acor”

Acoustic — “Acou”

Acquaint — “Acqu-a”

Acquired — “Acqu-i”

The dictionary order is:

Aconitine (comes first – ‘n’ comes before ‘r’ and ‘u’)

Acorn

Acoustic

Acquaint (‘a’ comes before ‘i’)

Acquired

Dictionary order: 5. Aconitine 1. Acorn 2. Acoustic 3. Acquaint 4. Acquired

So, the order is: 51234

Thus, correct option is (d).