A) \[OH(1),CHO(2),\text{ }C{{H}_{2}}OH(3)\] and \[H(4)\]
B) \[OH(1),\,\,C{{H}_{2}}\,\,OH(2),\,\,CHO(3)\] and \[H(4)\]
C) \[C{{H}_{2}}OH(1),\,\,CHO(2),\,\,OH(3)\] and \[H(4)\]
D) \[CHO(1),\,\,OH(2),\,\,C{{H}_{2}}OH(3)\] and \[H(4)\]
Correct Answer: A
Solution :
[a]The structure of D-glyceraldehyde is as : |
The priority of groups is decided by the following rules: |
(i) Atom having higher atomic number gets higher priority. |
(ii) If the priority cannot be decided by rule 1 then the next atoms are considered for priority order. |
(iii) Where there is a \[=\] bond or \[\equiv \] bond, both atoms are considered to be duplicated or triplicated. |
\[(\overset{H}{\mathop{\overset{|}{\mathop{C}}\,}}\,=O\] has higher priority than \[C{{H}_{2}}OH).\] |
Hence, the correct order of priority of group in D-glyceraldehyde is as follows: |
\[OH(1).\,\,CHO(2),\,\,C{{H}_{2}}OH(3)\]and \[H(4)\] |
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