On the basis if above passage, answer the questions

When tow different halogens react with each other, interhalogen compounds are formed. They can be assigned general compositions as \(XX'\), \(XX'_3\), \(XX'_5\); and \(XX'_7\), where \(X'\) is a halogen of larger size and \(X\) of smaller size and X is more electropositive than X increases, the number of atoms per molecule also increases.

Shape of \(XX'_5\) compound is:

Square pyramidal

The correct answer is option 4. Square pyramidal.

The \(XX'_5\) compound indicates that there is a central atom (\(X\)) bonded to five surrounding atoms or groups (\(X'\)). To determine the shape of this compound, we'll use the concept of molecular geometry, which depends on the arrangement of bonding pairs and lone pairs around the central atom.

The given options represent various molecular geometries, but we need to find the one that fits a molecule with five surrounding atoms or groups.

1. Trigonal Planar: This shape consists of three surrounding atoms or groups arranged in a flat, triangular arrangement around the central atom. It doesn't match the \(XX'_5\) formula, which implies five surrounding atoms.

2. Square Planar: In this shape, the central atom is surrounded by four atoms or groups arranged in a flat, square plane. Again, it doesn't match the \(XX'_5\) formula, which indicates five surrounding atoms.

3. Bent T shape: This shape typically involves a central atom surrounded by five groups, but it includes two lone pairs and three bonding pairs. However, the \(XX'_5\) formula specifies only surrounding atoms or groups, not lone pairs. So, it doesn't fit the given compound.

4. Square pyramidal: This molecular geometry consists of a central atom surrounded by four bonding pairs and one lone pair, resulting in a pyramid-like shape. This matches the \(XX'_5\) formula, where \(X\) represents the central atom and \(X'\) represents the surrounding atoms or groups.

Therefore, option 4, "Square pyramidal," is the correct choice as it corresponds to the molecular geometry of a compound with the formula \(XX'_5\), indicating a central atom bonded to five surrounding atoms or groups.