Organic Chemistry – Some Basic Principles and Techniques

The functional group that shows negative resonance effect is :

1. -OH
2. -OR
3. -COOH
4. -NH2

A species having carbon with sextet of electrons and can act as electrophile is called

1. pentavalent carbon
2. carbon free radical
3. carbanion
4. carbocation

Given below are two statements: In the light of the above statements, choose the most appropriate answer from the options given below:

1. Statement I is incorrect but Statement II is correct.
2. Statement I is correct but Statement II is incorrect.
3. Both Statement I and Statement II are correct.
4. Both Statement I and Statement II are incorrect.

Which of the following molecule/species is most stable?

1. [figure]
2. [figure]
3. [figure]
4. [figure]

Structure of 4-Methylpent-2-enal is :

1. H2C= H |C- CH3 | H |C-CH2- O \|C-H
2. CH3-CH2- CH3 |C=CH- O \|C-H
3. CH3- CH3 |CH-CH=CH- O \|C-H
4. CH3-CH2-CH= CH3 |C- O \|C-H

The correct stability order of carbocations is

1. (CH3)3C > CH3- CH2 > (CH3)2 CH > CH3
2. (CH3)3 C > (CH3)2 CH > CH3- CH2 > CH3
3. CH3 > CH3- CH2 > CH3- CH3 | CH > (CH3)3C
4. CH3 > (CH3)2 CH > CH3- CH2 > (CH3)3 C

IUPAC name of following compound is : CH3- NH2 |CH-CH2-CN

1. 2-Aminobutanenitrile
2. 3-Aminopropanenitrile
3. 2-Aminopentanenitrile
4. 3-Aminobutanenitrile

The difference in energy between the actual structure and the lowest energy resonance structure for a given compound is

1. electromeric energy
2. resonance energy
3. ionization energy
4. hyperconjugation energy

The interaction between bond and lone pair of electrons present on an adjacent atom is responsible for

1. Resonance effect
2. Electromeric effect
3. Hyperconjugation
4. Inductive effect

Number of compounds among the following which contain sulphur as heteroatom is . Furan, Thiophene, Pyridine, Pyrrole, Cysteine, Tyrosine