Which has higher melting point 4d series or 3d series?

Why Zinc has lowest melting point in 3d series?

Out of 2-methylhexane and 2,2-dimethyl butane, which one has higher melting point and which one has higher boiling point ?

Which among the following has higher melting point

In 3d series, the elements which exhibit highest and lowest melting point are respectively

Which of the following does not belong to 3d series of transition elements?