Match the List I with List II
A. Intrinsic Semiconductor   I. Fermi-level near valence band
B. n-type semiconductor   II. Fermi-level at middle of valence and conduction band
C. p-type semiconductor   III. Fermi-level near conduction band
D. Metals   IV. Fermi-level inside conduction band

Let us match each type of material with the position of its Fermi level:

A. Intrinsic Semiconductor - In an intrinsic (pure) semiconductor, the number of electrons in the conduction band equals the number of holes in the valence band. The Fermi level lies at the middle of the valence and conduction band (II).

B. n-type Semiconductor - In an n-type semiconductor, donor impurities provide extra electrons. The Fermi level shifts upward, near the conduction band (III).

C. p-type Semiconductor - In a p-type semiconductor, acceptor impurities create extra holes. The Fermi level shifts downward, near the valence band (I).

D. Metals - In metals, free electrons are abundant and the Fermi level lies inside the conduction band (IV).

Therefore, the correct matching is: (A) $$\to$$ II, (B) $$\to$$ III, (C) $$\to$$ I, (D) $$\to$$ IV.