From the following, how many compounds contain at least one secondary alcohol?

Choose the correct answer from the options given below:

• (I): Contains only primary ($$1^\circ$$) alcohols.
• (II): Contains one primary ($$1^\circ$$) alcohol and one secondary ($$2^\circ$$) alcohol.
  $$\implies \text{Counted}$$
• (III): Contains one primary ($$1^\circ$$) alcohol and one tertiary ($$3^\circ$$) alcohol.
• (IV): Contains one primary ($$1^\circ$$), one tertiary ($$3^\circ$$), and two secondary ($$2^\circ$$) alcohols.
  $$\implies \text{Counted}$$
• (V): Contains one tertiary ($$3^\circ$$) alcohol and one secondary ($$2^\circ$$) alcohol.
  $$\implies \text{Counted}$$
• (VI): Contains only primary ($$1^\circ$$) and tertiary ($$3^\circ$$) alcohols.

Conclusion:

Compounds (II), (IV), and (V) contain at least one secondary alcohol group.

Answer: Option B — Three