Correct statements among the following areA) All optical isomers are optically activeB) Diastereomers are always optical isomersC) Organic compounds not containing chiral carbon cannot show optical isomersimD) A compound with an absolute configuration of ‘R’ can be dextro (or) laevo rotatory

A) Meso compound is an optical isomer which is optically inactive∴ (A) is falseB) Any two stereo isomers which are not enantiomers are diastereomers. Ex:- (i) geometrical isomers are diastereomers (ii) ‘d’ isomer and meso isomer are diastereomers to each other ∴ (B) is falseC) Criteria for optical activity is absence of elements of symmetry (disymmetry) but not the presence of chiral carbon alone.Ex:- CHCl=C=CHCl is optically active but does not contain chiral carbon. ∴ (C) is falseD) R(+) and R(-) are possible ∴ (D) is true