Question

Identify the correct trend of acidic strength for the given alcohols:

• A. (i)>(iii)>(ii)
• B. (ii)>(i)>(iii)
• C. (ii)>(iii)>(i)
• D. (iii)>(ii)>(i)

Hint:

Lesser the steric hindrance, higher the acidity in alcohols.
Primary alcohols are generally more acidic than tertiary ones.

Answer 1

The Correct Option is B

Acidic strength in alcohols depends on the stability of the conjugate base (alkoxide ion). The more stable the alkoxide, the stronger the acid. - (ii) is ethanol (primary) – least hindered, most acidic. - (i) is isopropyl alcohol (secondary) – more hindered, less acidic. - (iii) is tert-butyl alcohol (tertiary) – most hindered, least acidic. Thus, the correct order is: \[ \text{(ii)>(i)>(iii)} \]