NEET Chemical Bonding and Molecular Structure — Set 9

Question 1

The bond length of a $ \ce{C=C} $ double bond is approximately:

Accepted Answer

The average bond length of a $ \ce{C=C} $ double bond, as in ethene, is ~134 pm due to increased electron density from two shared pairs, shorter than a $ \ce{C-C} $ single bond (~154 pm) but longer than a $ \ce{C#C} $ triple bond (~120 pm).

Question 2

Which molecule contains a coordinate bond where oxygen donates a lone pair to a positively charged species?

Accepted Answer

In $ \ce{H3O^+} $ (hydronium ion), oxygen donates a lone pair to $ \ce{H^+} $, forming a coordinate bond.

Question 3

Which molecule has a trigonal bipyramidal electron pair geometry but a linear molecular shape?

Accepted Answer

In $ \ce{XeF2} $, xenon has 5 electron pairs (2 bonding, 3 lone) with $ sp^3d $ hybridization, giving a trigonal bipyramidal electron geometry and a linear shape.

NEET Chemistry: Chemical Bonding and Molecular Structure — Practice Set 9

Q1. The bond length of a \( \ce{C=C} \) double bond is approximately:

Q2. Which molecule contains a coordinate bond where oxygen donates a lone pair to a positively charged species?

Q3. Which molecule has a trigonal bipyramidal electron pair geometry but a linear molecular shape?

Q4. Which of the following molecules exhibits \( sp^3d \) hybridization?

Q5. The hybridization of xenon in \( \ce{XeF6} \) is:

Q6. The bond angle in \( \ce{XeF2} \) is:

Q7. The bond order of \( \ce{C2^+} \) ion, based on molecular orbital theory, is:

Q8. Which species has a bond order of 1 and is paramagnetic?

Q9. Which molecule has a bond angle of approximately 90° due to lone pair repulsion in a square pyramidal geometry?

Q10. What is the bond angle in a molecule with a trigonal planar geometry?