Question

8. Circle the answer. Which is the correct IUPAC name for the following compound? OH A. 4-Isopropyl-1,1-dimethyl-1-pentanol B. 5-Isopropyl-1,1-dimethyl-2-hexanol C. 1,1,4,5-Tetramethyl-1-hexanol D. 3,5,6-Trimethyl-2-heptanol E 2,5,6-Trimethyl-2-heptanol 9. A chemist attempted unsuccessfully to form iodoethane from ethanol using Nal. Why did the reaction fail? A. I was not a good enough nucleophile. B. A secondary or tertiary alcohol was needed. c. OH is a poor leaving group. D. Na was a poor counterion.

Answer 1

Q8. Correct answer is : (D.) 3,5,6-Trimethyl-2-heptanol

Q9. Correct answer is : (B.) A secondary or tertiary alcohol was needed.

Explanation

Q8. The longest carbon chain is 7 carbon atoms long. Hence, the name "hept"

Since alcohol group (-OH) is given more priority over alkane group, therefore, numbering to carbon chain starts from that end which gives alcohol group lowest substituent number.

There are 3 methyl groups present on 3rd, 5th and 6th carbon