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Regarding diamond
I) C–C bond length is 1.54A°
II) It has least refractive index among solids
III) It has a 3-dimensional structure.
The correct combination is

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I & III are correct

All are correct

II & III are correct

I & II are correct

answer is B.

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Detailed Solution

I. In diamond, each carbon atom undergoes sp³ hybridization and linked to four other carbon

atoms by using hybridized orbitals in tetrahedral fashion. The C–C bond length is 154 pm=1.54 $\overset{°}{A}$ .

II. Diamond has a very high refractive index of 2.42, which means that it bends light to a greater degree than most other solids.

III. The structure of Diamond extends in space and produces a rigid three-dimensional network of carbon atoms.

Hence, statements I and III are correct.

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