Question

Which is the most stable Newman projection of the molecule below, assuming a Br-CH3 gauche interaction is 0.5 kcal/mol and a CH3-CH3 gauche interaction is 1.0 kcal/mol? Br CH3 - CH- -CH 2 -CH3 CH3 CH3 CH3 H Н. Br Br H H H Br H H H CH3 Br сн. сн., H a. сн. c. H d. CH Oooooooo Moving to another question will save this response MacBook AS ese

Answer 1

lon two groups are Gamche: when in any conformation, the dihedral angle between on formation tion is called gauche. here given, bo, the Oz - Br Gamle interaction CH₂ - Colg Gauche 0.5 Keall mole Keal/mole interaction CH3 H a Br H Here only one CH₂-By Ganche interachi in present. Energy Kial/mole H =0.5

molecule as it's shuchure is CH 3 CH3 CH₂ - This does not represent the Giren .CH3 H H jt C - Br 1 - H ܫ "This option is not Considered. CH₃ H © म E- CH3 This also does not represent the given molecule, as it's struchure to By H By 1 C CH 1 - N .. This CH3 is not considered. option BY flere, one Chy-crt3 Ganhe interaction H i present. 0 o CH3 J The energy is = 1.0 Knal/more or option @ has the lowest energy, so it is moot- stabe. Correct 버 CH3 Br . aunier in 0 option ③ # CH3