Question

the most symmetrical structure is possessed by a) water b) methane c) ammonia d) hydrogen sulphide​

Answer 1

Answer:

METHANE

Explanation:

WATER and HYDROGEN SULPHIDE have similar structures.

Methane is Tetrahedral.

Ammonia Tetrahedral, with one line pair.

Except Methane, every structure is having line pair(s). And we know about line pair repulsions...

Not completely sure about the Reason, But METHANE is correct.

Thanks!

Answer 2

Answer:

CH4

Explanation:

Bond angle differs in H2O, NH3,CH4 and H2S even though they all are sp3 hybridized due to the presence of lone pairs of electrons. The shapes of the molecules are distorted in the presence of lone pairs.

In CH4, four hydrogen atoms are arranges at the corners of regular tetrahedron and the bond angle is 109.5 degrees and has tetrahedral shape. There are no lone pairs o the central carbon atom present in this molecule.It is most symmetrical

In ammonia, there is one lone pair of electrons o nitrogen atom which results in repulsion between bonding and lone pairs and ammonia has a trigonal pyramidal structure with bond angle 107.0 degrees.

In water molecule, there are 2 lone pairs on oxygen atom, which results in repulsion between bonding and lone pairs and water has a bent shape with bond angle 104.5 degrees.

Hydrogen sulphide also has 2 lone pairs and has similar structure like water.

Thus, we can say that methane has the most symmetrical structure.