Question

PROBLEM 5-7 Which member in each of the following sets ranks higher (а) -Н ог-Вr (c) -CH3 or-CH2CH3 8- (b) -Cl or -Bг (d) -NH2 or-OH P BL CCHSCH3 НО- Б PRORIFM S. 0-2 moldor (a Я O1-2 maidontT 2d PROBLEM 5-9 Orient each of the following drawings so that the lowest-ranked group is toward the rear, and then assign R or S configuration: (c) (b) edW C (a) S H H w onsxardoloyo to noitoss 3 mo 1ooqxs OY bluow to4 18 PROBLEM 5-10 Assign R or S configuration to the chirality center in each of the following molecules: он (b) CHз (a) H3C CO2H H н7 HS CO2H
so answers are on back but how can you tell between S and R configuration

Answer 1

-- or Br 18t (0) - ch or, - - CM3 and 2nd 18+ C or - Br. - and 18+ Now or on 18+ 18+ Higher Rank 59 () º - Anti Clock wir. Start from I then move to 2 then 3, Ib Rotation is Onticlockwise then. Configuration is s Inter Change to w 2 with y & I with 3 Always make two Inter Change then only configuration remain same. O P 1273 Clock to se go K

Inter change withy e 2 with 3 - 2 3 Anti Clockwise 5.10 (9) соби sn Anticlockwise & 4th ranked group is on dash So, it o 's' Coon Interchange & with 4 2 with 3 . 1 2 3 Anticlockwize It in s