The priority sequence of the alky`1` groups is

Options

A. `CH_(3) gt 1^(@) gt2^(@) gt 3^(@)`
B. `CH_(3) gt 1^(@) gt 3^(@) gt 2^(@)`
C. `3^(@) gt2^(@) gt 1^(@) gt CH_(3)`
D. `3^(@) gt1^(@) gt2^(@) gt CH_(3)`

Answer

C

Explanation

The directly attached atom having the highest atomic number has the highest priority. If both ligands have the same atom bonded to the chiral center, the priority is determined by moving to the next atom in the chain. Therefore
`underset(C(C C C))underset(CH_(3))underset(|)overset(CH_(3))overset(|)(CH_(3)-C- gtC)H_(3)-underset(C(C CH))underset(H)underset(|)overset(CH_(3))overset(|)(C)- gtunderset(C(CHH))(CH_(3)-CH_(2)- gt)underset(C(HHH))(CH_(3))-`