Which of the following substituents has ...

Which of the following substituents has +M (Mesomeric) effect ?

`-CN`

`-NR_(2)`

`-NH_(2)`

`-NHR`

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The correct Answer is:

B, C, D

`-NR_2 , - NH_2 , - NHR` groups are +M groups.

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Which of the following has magnesium ?

Carbonic anhydrase

Haemocyanin

Chlorophyll

Vitamin `B_12`

Volvox

Vaucheria

Ectocarpus

Ulothrix

`CH_(3)-overset(oplus)(C)H_(2)`

`CH_(2)-overset(oplus)(C)H`

`CH_(2)=CH-overset(oplus)(CH_(2))`

`overset(overset(CH_(2)-CH_(2)^(oplus))(|))(NO_(2))`