Question

Core metal of chlorophyll is

• A. Cu
• B. Mg
• C. Fe
• D. Ni

Answer 1

Answer: (B)

Mg

Structure of chl-a look like tadpole.

It has Porphyrin head and phytol tail.

Porphyrin head- Size is $15X15A^0$. It is hydrophilic and acidic in nature. Its a tetrapyrole structure. Mg is a core metal held by 2 coordinate and 2 covalent bonds.

Phytol tail- Size is $20A^0$ long. It is hydrophobic and alcoholic in nature. Tail remain embedded in lipid bilayer of thylakoid membrane.

So, the correct answer is 'Mg'.