Meaning of catenation

Catenation is the property of an element to form bonds with itself, giving chains or rings such as: $E-E-E-E$ This property is favored when the element forms a sufficiently strong $E-E$ bond.

Elements given

The options are group 14 elements: $\text{Si, Ge, Sn, Pb}$

In group 14, the tendency for catenation generally decreases down the group because the atomic size increases and the $E-E$ bond becomes weaker.

Trend of catenation in group 14

The general order is: $\text{C} > \text{Si} > \text{Ge} > \text{Sn} > \text{Pb}$

• Si shows catenation.
• Ge shows limited catenation.
• Sn shows very little but still some tendency.
• Pb essentially does not show catenation because the $\text{Pb-Pb}$ bond is too weak.

Evaluate each option

• A: Ge — shows limited catenation, so not correct.
• B: Si — clearly shows catenation, so not correct.
• C: Sn — shows very weak/limited catenation, so not the best answer.
• D: Pb — does not show catenation.

Final answer

Therefore, the element that does not show catenation is: $\boxed{\text{Pb}}$

Comparison with stored correct answer

Stored correct answer: D

Derived answer: D (Pb)

These match.