Number of chiral carbon atoms in a named compound

This type of question, asked 4 times: 21 Apr 2025 S1, 17 Apr 2026 S2, 18 Apr 2026 S1, 19 Apr 2026 S1. All 4 questions below, oldest first.

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Question 1
21 Apr 2025 S1
92 $What is the number of chiral carbon atoms present in 3,4-Dibromohexane?$
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Question 2
17 Apr 2026 S2
16 $How many chiral carbon atoms are present in 2-Iodo-3, 4, 5-trimethylhexane ?$
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Question 3
18 Apr 2026 S1
17 $What is the of number of chiral carbon atoms present in 2-Bromo-3,4,5-trimethylhexane ?$
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Question 4
19 Apr 2026 S1
15 $What is the number of chiral carbon atoms in 2-chlorobutane?$
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Question 1