For 'invert sugar', the correct statement(s) is (are)
(Given : specific rotations of (+) - sucrose, (+) - maltose, + `66^(@),+140^(@), -52^(@) and 92^(@)` respectively)

Options

A. invert sugar' is prepared by acid catalyzed hydrolysis of maltose
B. invert sugar' is an equimolar mixture of D-`(+)`-glucose and `D-(-)` -fructose
C. specific rotation of 'invert sugar' is `-20^@`
D. on reaction with `Br-(2)` water , 'invert sugar' forms saccharic acid as one of the products.

Answer

B,C

Explanation

Invert sugar is an equimolar mixture of `D-(+)`-glucose and `D-(-)` - fructose. Since specific rotations ,i.e., `[alpha]` of `L-(-)` - glucose and `L-(+)`-fructose are `-52^@ and +92^@` respectively. Therefore , `[alpha]` of `D-(+)` -glucose and `D-(-)` - fructose are `+52^@ and -92^@` respectively.
`therefore` Specific rotation of invert sugar `=0.5xx[alpha] of D-(+)`-glucose `+0.5xx[alpha_(D)] of D-(-)`-fructose `=0.5(+52)+0.5(-92)=-20^@`.