Question

Geometric Geometric Geometric 23. Organic molecules which are optically active and they are mirror images to each other are called....... Enantiomers. a. Chain isomers. d. Geometrical isomers c. Diastereoisomers. 24. The organic molecule that rotates the plane-polarized light to left is called a. Dextrorotatory b. Functional isomers c. Positional isomers d. levorotatory 25. The organic molecule that rotates the plane-polarized light to right is called a. Dextrorotatory b. Functional isomers c. Positional isomers d. levorotatory 26. Chiral molecules are organic molecules that have .......... a. Achiral carbon atom b) Chiral carbon atom c. Sp2 carbon atom d. Sp carbon atom 27. Organic molecules that have chiral carbon atom are called ........... @ Optically active molecules b. Optically inactive molecules c. Positional isomers d. Chain isomers 28. The chiral carbon is the carbon atom which surrounds by ........... a. Three similar atoms or groups b. Four similar atoms or groups C. Three different atoms or groups Four different atoms or groups

Answer 1

23.

b. Enantiomers

Enantiomers are the non-superimposable mirror image molecules. Thus, they are mirror images to each other.

Enantiomers are optically active as they rotate the plane polarized light.

Chain isomers are structural isomers having different chain lengths.

Diastereomers are the non-superimposable non-mirror images of each other.

cis and trans-isomers are generally called the geometric isomers. These are neither mirror image nor superimposable.

24. d. Leavorotatory

25. a. Dextrorotatory

The organic molecules which can rotate the plane-polarized light towards right side are named as dextro-rotatory compounds (+) and those which can rotate the plane-polarized light towards left are called leavorotatory compounds (-).

Same compounds having different stereo-arrangement of groups around the chiral atoms and more specifically different enantiomers of the same compound behaves differently with light i.e., one enantiomer rotates the plane-polarized light towards right and the other towards left.

26. b. Chiral carbon atom

27. a. Optically active molecules

28. d. Four different atoms or groups

The organic molecules which contain a carbon atom with four different groups or atoms attached to it are called as chiral molecules and that carbon atom is called as the chiral carbon atom.

If a compound rotates the plane-polarized light towards clockwise or anticlockwise direction, the compound is said to be optically active. For a compound to be optically active, the essential criteria is that it should possess a chiral centre. Hence the compounds containing chiral carbon atom are optically active molecules.