+2, because Beryllium is in the Group II of the periodic table.
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Nitrate
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One single covalent bond, hope this helps!
The monochloroderivatives will be obtained by substituting chemically non equivalent hydrogen with chlorine atom, one by one
So the possible monochloro derivatives of 2,4-dimethylpentane (figure 1) are shown in figure (2)
The correct Answer for this question is D