Assertion: Trihydroxyglutaric acid `(HO_(2)C-CHOH-CHOH-CHOH-CO_(2)H)` exists in four stereoisomeric forms, two of which are optically acitve while the other are meso-forms.
Reason: It contains two asymmeric and one pseudo-asymmeric carbon atom.

Assertion: 2,3 -dichloropentene has four stereoisomerse. Reason: It contains two chiral carbon atoms.

Assertion: Addition of Br_(2) to 1 -butane gives two optical isomers. Reason: The product contains one asymmetric carbon atoms.

Lactic acid, CH_(3)CHOH.COOH exists in two optically active forms. Explain.

Tartaric acid [HO_(2)CCH(OH)CH(OH)CO_(2)H] was an important compound in history of stereochemistry. Two naturally occuring forms of tartaric acid are optically inactive. One optically inactive form (P) has a melting point of 210- 212^(@) C and can be separated into two optically acitve forms, whereas other optically inactive form (Q) cannot be resolved further. Optically inactive form Q is

statement I: Addition of Br_(2) to 1 -butene gives two optical isomers. statement II: The product contains one asymmetric carbon atoms.

Assertion : H_(2) exists in two isomeric forms known as ortho and para forms Reason : The ortho and para H_(2) differ in the spin of theire electron.