Isomerism

Which among the given molecules can exhibit tautomerism? [figure]

1. III only
2. Both I and III
3. Both I and II
4. Both II and III

The possible stereo-structures of CH3CHOHCOOH, which are optically active, are called

1. atropisomers
2. enantiomers
3. mesomers
4. diastereomers

In an SN1 reaction on chiral centers, there is

1. inversion more than retention leading to partial racemisation
2. 100% retention
3. 100% inversion
4. 100% racemisation

The number of structural isomers possible from the molecular formula C3H9N is

1. 5
2. 2
3. 3
4. 4

Given : [figure] Which of the given compounds can exhibit tautomerism?

1. II and III
2. I, II and III
3. I and II
4. I and III

Which of the following compounds will undergo racemisation when solution of KOH hydrolyses? [figure]

1. (i) and (ii)
2. (ii) and (iv)
3. (iv)
4. (i) and (iv)

The order of stability of the following tautomeric compounds is [figure]

1. II > I > III
2. II > III > I
3. I > II > III
4. III > II > I

Given: [figure] I and II are

1. identical
2. a pair of conformers
3. a pair of geometrical isomers
4. a pair of optical isomers

Number of isomeric alcohols of molecular formula C6H14O which give positive iodoform test is

1. three
2. four
3. five
4. two

Which of the following acids does not exhibit optical isomerism?

1. Maleic acid
2. -amino acids
3. Lactic acid
4. Tartaric acid