JEE Main levelSingle correct optionDifficulty 2 of 3ap043
Butan-1-ol, butan-2-ol and 2-methylpropan-2-ol are tested separately with Lucas reagent at room temperature. The observations in the order given are
Ano turbidity at room temperature; turbidity in about 5 minutes; turbidity immediately
Bturbidity immediately; turbidity in about 5 minutes; no turbidity at room temperature
Cturbidity in about 5 minutes; turbidity immediately; no turbidity at room temperature
Dno turbidity; no turbidity; turbidity immediately
Answer: A
Primary butan-1-ol gives no turbidity at room temperature, secondary butan-2-ol gives turbidity in about five minutes, and tertiary 2-methylpropan-2-ol gives it immediately.