(i) $\mathop { - \mathop C\limits_|^| - \mathop C\limits^| = \mathop C\limits^| - \mathop C\limits_|^| - }\limits_{{\text{Trans - 2 butene (}}u = 0{\text{)}}} $
(iv) $\mathop {{C_2}{H_5}OH}\limits_{ + I} $

$(A)\, CH_3 - CH_2 - C \equiv C^-$ $(B) \,CH_3 -CH_2 - S^-$
$(C) \,CH_3 - CH_2 - CO^-_2$ $(D)\, CH_3 -CH_2 - O^-$
$(A) \,\,CH_3-CH_2-NH_2$

$(i)$ ${C_6}{H_5}{N^ + } \equiv NC{l^ - }$ $(ii)$ ${C_6}{H_5}{N^ + } \equiv N$
$(iii)$ ${{\overset{\centerdot }{\mathop{C}}\,}_{6}}{{H}_{5}}$ $(iv)$ $C_6H_5Cl$

