Question

How many chiral carbon atoms are present in 2-Iodo-3, 4, 5-trimethylhexane ?

• A. \(2\)
• B. \(3\)
• C. \(4\)
• D. \(1\)

Hint:

A chiral carbon has four different groups attached.

Answer 1

The Correct Option is B

Step 1: Draw and mark:
Chain: C1($\text{H}_3$)-C2(H)(I)-C3(H)($\text{CH}_3$)-C4(H)($\text{CH}_3$)-C5(H)($\text{CH}_3$)-C6($\text{H}_3$).

Step 2: Look for repeated groups:
C5 carries a methyl branch and also the terminal C6 methyl, which are identical, so C5 is achiral. C2, C3 and C4 each have four different groups. Total = 3 (B).

Final Answer:
3 chiral centres. \[ \boxed{3} \]