Organic Basics (GOC) · IUPAC functional group priority

In IUPAC nomenclature, the correct order of decreasing priority of functional group is :

(1) $-\mathrm{CONH_2}$ , $\mathord{>}\mathrm{C{=}O}$ , $-\mathrm{CHO}$ , $-\mathrm{NH_2}$ , $-\mathrm{C{\equiv}C}-$
(2) $-\mathrm{CONH_2}$ , $-\mathrm{COOCH_3}$ , $-\mathrm{CHO}$ , $-\mathrm{NH_2}$ , $-\mathrm{OH}$
(3) $-\mathrm{CONH_2}$ , $-\mathrm{CHO}$ , $\mathord{>}\mathrm{C{=}O}$ , $-\mathrm{NH_2}$ , $-\mathrm{C{\equiv}C}-$
(4) $-\mathrm{CONH_2}$ , $-\mathrm{CHO}$ , $-\mathrm{CN}$ , $-\mathrm{NH_2}$ , $-\mathrm{C{\equiv}C}-$

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