Question

What is the of number of chiral carbon atoms present in 2-Bromo-3,4,5-trimethylhexane ?

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

Hint:

A carbon is chiral if it carries four different groups, so check each carbon of the main chain.

Answer 1

The Correct Option is C

Step 1: Write the full formula:
$\text{CH}_3-\text{CHBr}-\text{CH(CH}_3)-\text{CH(CH}_3)-\text{CH(CH}_3)-\text{CH}_3$.

Step 2: Test each carbon:
C1 and C6 are $\text{CH}_3$ groups, so they cannot be chiral.
C5 is bonded to two $\text{CH}_3$ groups (the substituent and C6), so it has two same groups.
C2, C3 and C4 each have four different groups around them, so these three are stereocentres.

Final Answer:
The number of chiral carbons is $3$, option (C). \[ \boxed{3} \]