Question

Consider the following statements:
I. In diamond, each carbon atom is $s{p}^3$ - hybridised.
II. Graphite has planar hexagonal layers of carbon atoms.
III. Silicones being surrounded by non-polar alkyl groups are water repelling in nature.
IV. The order of catenation in group 14 elements is $Si>C>Sn>Ge>Pb$
The correct statements are

• A. I, II, III
• B. II, III, IV
• C. I, II, IV
• D. I, III, IV

Answer 1

Answer: (A)

(I, II) In diamond, hybridisation of carbon is $s{p}^3$ and graphite has planar hexagonal layer of $C$-atoms. The hybridisation of each $C$ -atom in graphite is $s{p}^2$.

(III) Silicones are organo-silicon polymers formed from inorganic and organic monomer having chemical formula ${\left(R_{2}SiO\right)}_n$, due to non-polar alkyl group, silicones are water repelling in nature.

(IV) The catenation tendency in group $14$ elements decreases due to decrease in element bond strength. Thus, the correct order is

$C>>Si>Ge\approx Sn$
Hence, statement (IV) is incorrect.