For 'invert sugar', the correct statement(s) is(are). (Given: specific rotations of (+)-sucrose, (+)-maltose, L-(-)-glucose and L-(+)-fructose in aqueous solution are +66°, +140°, -52° and +92°, respectively)

Invert sugar is an equimolar mixture of D-(+)-glucose and D-(-)-fructose. Sucrose on hydrolysis gives an equimolar mixture of D-(+)-glucose and D-(-)-fructose, which is known as invert sugar. The specific rotation of sucrose is +66°. On hydrolysis, the specific rotation changes to -20°. This change in sign of rotation is called inversion.

The specific rotation of invert sugar can be calculated as follows:

Specific rotation of invert sugar = (Specific rotation of D-(+)-glucose + Specific rotation of D-(-)-fructose)/2
Specific rotation of invert sugar = (+52° - 92°)/2 = -20°

Therefore, the correct statements are:

1. 'Invert sugar' is an equimolar mixture of D-(+)-glucose and D-(-)-fructose.
2. Specific rotation of 'invert sugar' is -20°.

The statement 'On reaction with Br₂ water, 'invert sugar' forms saccharic acid as one of the products' is incorrect because only glucose reacts with Br₂ water to form saccharic acid. Fructose does not react with Br₂ water. The statement that 'Invert sugar' is prepared by acid-catalyzed hydrolysis of maltose is also incorrect; it's prepared by the hydrolysis of sucrose.