Chemistry : Organic Chemistry – Some Basic Principles and Techniques

Among the following statements about the molecules X and Y, the one(s) which correct is (are)

• X and Y are diastereomers

• X and Y are enantiomers

• X and Y are both aldohexoses

• Xis a D-sugar and Y is an L-sugar

The correct structure of the dipeptide gly-ala is

Amongst the following, the one which can exist in free state as stable compound is

• C₇H₉O

• C₈H₁₂O

• C₆H₁₂O

• C₁₀H₁₇O

Compound A treated with NaNH₂ followed by CH₃CH₂Br gave compound B. Partial hydrogenation of compound B produced compound C, which on ozonolysis gave a  carbonyl compound D, (C₃H₆O). Compound D did not respond to iodoform test with I₂/KI and NaOH. Find out the structures of A, B, C and D.

An organic compound with molecular formula C₉H₁₀O forms 2, 4-DNP derivative, reduces Tollen's reagent and undergoes Cannizaro reaction. On vigorous oxidation it gives a dicarboxylic acid which is used in the preparation of terylene. Identify the organic compound.

The well known compounds, ( +) - lactic acid and (-) - lactic acid, have the same molecular formula, C₃H₆O₃. The correct relationship between them is

• constitutional isomerism

• geometrical isomerism

• identicalness

• optical isomerism

The stability of Me₂C=CH₂ is more than that of MeCH₂CH=CH₂ due to

• inductive effect of the Me groups

• resonance effect of the Me groups

• hyperconjugative effect of the Me groups

• resonance as well as inductive effect of the Me groups

Which of the following compounds has maximum volatility?

Which one of the following will show optical isomerism?

Which of the following compounds can exhibit both geometrical isomerism and enantiomerism ?

• ${\mathrm{CH}}_3-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}$

• ${\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{CH}\left({\mathrm{CH}}_3\right)-\mathrm{CH}=\mathrm{CH}-{\mathrm{CH}}_3$

• ${\mathrm{CH}}_3{\mathrm{CH}}_2-\left({\mathrm{CH}}_3\right)\mathrm{C}=\mathrm{CH}-\mathrm{COOH}$

• ${\mathrm{CH}}_3-\mathrm{CHOH}-\mathrm{COOH}$