Rutik posted an Question
November 05, 2020 • 23:50 pm 30 points
  • IIT JAM
  • Chemistry (CY)

The amino acid with r configuration is co h co.h hjn h ch,ch, hjn-h ch sh (b) (a) co,h co,h hn h (c) h,n h ch ch sch, (d) ch ph

The amino acid with R configuration is CO H CO.H HJN H CH,CH, HJN-H CH SH (B) (A) CO,H CO,H HN H (C) H,N H CH CH SCH, (D) CH Ph

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    Priyanshu kumar best-answer

    option B

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    sir priority kese dena matlb woh atomic no. add karke karna hota he .i dont know properly can u explain?

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    One looks at the atoms directly attached to the chiral carbon (or alkene carbon when determining E or Z) and the priority is determined by the the atomic number of the atoms. If two atoms are the same, then you compare the highest priority atom attached to the two atoms in question. In the case you are referring to, -CO2H vs. -CH2SH, two carbons are directly attached to the chiral center. You then compare O (atomic # 8) vs S (atomic #16). S has the higher priority. It doesn't matter that there are multiple O's on the carboxylic acid. The atoms are compared individually and the priority is assigned at the first point of difference. 

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    thanku

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