\(RCOOH>HOH>ROH>HC \equiv CH\)
$(CH_3)_3 \, \overline C , \overline C Cl_3 ,(CH_3 )_2 \overline C H ,C_6 H_5 \overline C H_2$
$[Nu^- = (1) PhO^- , (2) AcO^-, (3) HO^-, (4) CH_3O^-]$