Question

Rotating around the selected bond select the gauche conformation. Br OH Br Br Br HBr OH Br கதம் -OH H FH H H HOT H OH OH C A D E OD DA OE

Answer 1

This is newman projection of the molecule. In gauche conformation, bulky groups are present at diahedral angle of 60⁰. So, from given structures, strucutre  A that is option D is correct. Please find attached file for complete guide and answer .

First, we will Learn How to draw Newman projection. @ We will look lingthwise down a specific Bond interest . The front' atom denoted as dot and back' atan as 1 2) Larger croce So, In given question Br Ch₂ CH₂OH. Br Br I Br и H sh li 1,14 11. ой 'k "oh I h и On Look through this (-e) Bond 'anti' conformation Now, we will draw different conformation possible

by rotating atons of back Carbon, We get different confornation Br W Rotate fr h . 60 HO h To ladoune Ho H OH k и и H H h Canti) Po "Eclipsed" ( "gauche" 60 Br Bor Oh и h и On K h h h p"Eclipsed" "gauche" "Eclipsed" ① In Eclipsed state, Br 8-on are on Same side, Hence there is sligh Energy of Confornation. In partially Eclipsed (P. Eclipsed) - Bor & -t are on sam side causes repution belt Less than - Br & -on (Eclipsed) form. In anti form for 8-on group are opposite to each other, so there possibility of Electronic repuhion, fence it is most stable & lowest Evergy. 8 In ganhe form the -ford-ou are bo to each other, so their in lower respection between them compared to Eclipsed & Partialley Eclipsed

So, Back to question genache forum will be Br H .oh 'Gauche form H h и

Br Br h h И On и w ON Partially Eclipsed "ant" B D & E are wrong structures as they have shown for 8-on on same Carbon same Contoh (во 4 T < И ko h - Same Carbon On h