Question

Using ecipsed and a Draw the most stable confornaten for 4he madecule C 3-C4 aris, drau for An newman ptojections staggaced confamation of2s dimethylherane

Answer 1

CH3 CH3 CH3 – CH – CH2 – CH – CH – CHE ....2. 3 .4 . 5. 6 .... 1-GH7 TH HS i-C3 Hj e-C₂ H7 staggared Cmost stable Eclipsed cunstable)

→ Rear Carbon t Front Carbon i- C₃H7 ( iso propyl group) —CH-CH3
i-C₃H₇ = represents isopropyl group.

Isopropyl group is a larger group, hence placing larger groups apart from each other in staggered conformation, reduces the repulsion and makes the molecule more stable.

But in Eclipsed conformation these larger groups are arranged close to each other and gets more repulsion which causes the molecule unstable in this conformation.