Question

(a) HF has a higher boiling point than HCl

(b) Acetic acid dimerises in benzene due to H-Bond
(c) C -C Bond order in benzene is 1.5
(d) sigma* 2s orbital has higher energy than sigma 2pz in CO molecule.
Correct statements are/is

(a) (b) & (d) only
(b) (b) only
(c) (a) & (d) only
(d) All are correct

Answer 1

The correct statements are: (a) HF has a higher boiling point than HCl, (b) Acetic acid dimerizes in benzene due to H-Bond, and (d) sigma* 2s orbital has higher energy than sigma 2pz in CO molecule.

Step-by-step explanation:

The correct statements are (a) (b) & (d) only.

Step-by-step explanation:

1. (a) HF has a higher boiling point than HCl: This is because HF is capable of forming hydrogen bonding, which is a stronger intermolecular force compared to the London dispersion forces present in HCl.
   
2. (b) Acetic acid dimerizes in benzene due to H-Bond: Acetic acid (CH3COOH) can form hydrogen bonds with other acetic acid molecules, resulting in the formation of dimers.
   
3. (d) sigma* 2s orbital has higher energy than sigma 2pz in CO molecule: In a CO molecule, the sigma* 2s orbital has a higher energy because it is antibonding and has a node between the carbon and oxygen atoms, while the sigma 2pz orbital is bonding and does not have a node.