AP EAMCET · Chemistry · Chemical Bonding and Molecular Structure

$X$ and $Y$ are two covalent molecules in which the hybridization of the central atoms is the same, but the shapes are different. What are $X$ and $Y$ ?

A ${XeF}_{4}, {NH}_{3}$
B ${XeF}_{2}, {PF}_{5}$
C ${BF}_{3}, H_{2} O$
D ${CH}_{4}, {BeCl}_{2}$

Verified Solution

Answer & Solution

Correct Answer

(B) ${XeF}_{2}, {PF}_{5}$

Step-by-step Solution

Detailed explanation

XeF2 and PF5 both have sp3d hybridisation. Howerver, their shapes will be different according to the VSEPR theory. Xenon fluoride structure has two covalent bonds between one xenon atom and two fluorine atoms. The xenon atom also holds 3 lone pairs of electrons. It has…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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X and Y are two covalent molecules in which the hybridization of the central atoms is the same, but the shapes are different. What are X and Y?

Step-by-step Solution

$X$ and $Y$ are two covalent molecules in which the hybridization of the central atoms is the same, but the shapes are different. What are $X$ and $Y$ ?