2, 5-dimethyl-6-carboxy-hex-3-enal

6-formyl-2-methyl-hex-3-enoic acid

2, 5-dimethyl-5-carboxy-hex-3-enal

2, 5-dimethyl-6-oxo-hex-3-enoic acid

Cl–CH=CH–CH₃

Cl–CH=CH–NO₂

Cl–CH=CH–OCH₃

Cl–CH=CH₂

(iii) < (i) < (ii) < (iv) < (v)

(iii) < (iv) < (ii) < (i) < (v)

(v) < (i) < (iv) < (ii) < (iii)

(v) < (iii) < (ii) < (iv) < (i)

C₆H₅NH₂

$${\rm{N}}{{\rm{H}}_2} - \mathop C\limits^{\mathop \parallel \limits^O } - {\rm{N}}{{\rm{H}}_2}$$

C₆H₅NO₂

CH₃CH₂-C $$ \equiv $$ N