Organic Chemistry – Some Basic Principles and Techniques

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

According to IUPAC system, the compound [figure] is named as

1. Cyclohex-2-en-1-ol
2. 1-Hydroxyhex-2-ene
3. Cyclohex-1-en-3-ol
4. Cyclohex-1-en-2-ol

The ascending acidity order of the following H atoms is [figure]

1. A < B < D < C
2. A < B < C < D
3. D < C < B < A
4. C < D < B < A

The total number of 'Sigma' and 'Pi' bonds in 2-formylhex-4-enoic acid is .