Introduction To Organic Chemistry

Step 1: A staggered conformation is one in which the hydrogen atoms on the front carbon lie in between those on the rear carbon, giving maximum separation.

Step 2: Analysis of the given figures:
• Structure (1): Sawhorse representation with hydrogens alternating ⟹ staggered
• Structure (2): Newman projection showing hydrogens exactly between each other ⟹ staggered
• Structure (3): Newman projection with hydrogens aligned ⟹ eclipsed
• Structure (4): Sawhorse representation with overlapping hydrogens ⟹ eclipsed

Step 3: Hence, the staggered conformations are (1) and (2).

Step 1: Identify the structure. The compound is CH CH(OH)CH , an alcohol with -OH group.
Step 2: Count carbons:
- Total 3 carbons: CH -CH-CH (OH on middle carbon).
Step 3: Name the parent chain: 3 carbons = propane. The -OH group is on the 2nd carbon, so it's propan-2-ol.
Step 4: Verify:
- Propan-1-ol: OH on 1st carbon.
- Ethanol: 2 carbons.
- Butan-2-ol: 4 carbons.
Matches option (2).