Which of the following resonating structures of 1-methoxy-1,3-butadiene is least stable?

1. \(\stackrel{\ominus}{\mathrm{C}} \mathrm{H}_2-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}=\stackrel{\oplus}{\mathrm{O}}-\mathrm{CH}_3\)
2. \(C H_2=\mathrm{CH}_2-\stackrel{\ominus}{\mathrm{C}} \mathrm{H}-\mathrm{CH}=\stackrel{\oplus}{\mathrm{O}}-\mathrm{CH}_3\)
3. \(\stackrel{\ominus}{\mathrm{C}} \mathrm{H}_2-\stackrel{\oplus}{\mathrm{C}} \mathrm{H}-\mathrm{CH}=\mathrm{CH}-\mathrm{O}-\mathrm{CH}_3\)
4. \(\mathrm{CH}_2=\mathrm{CH}-\stackrel{\ominus}{\mathrm{C}} \mathrm{H}-\stackrel{\oplus}{\mathrm{C}} \mathrm{H}-\mathrm{O}-\mathrm{CH}_3\)

The least stable resonance structure among the following is:

1.		2.
3.		4.

Hyperconjugation involves the overlap of the following orbitals:

1. σ - σ

2. σ - p

3. p - p

4. π - π

The IUPAC name of the compound shown below is:

1. 2-bromo-6-chlorocyclohex-1-ene

2. 6-bromo-6-chlorocyclohexene

3. 3-bromo-1-chlorocyclohex-1-ene

4. 1-bromo-3-chlorocyclohexene

Which of the following structures are superimposable?

(1) 

(2) 

(3) 

(4) 

(1) 1 and 2

(2) 2 and 3

(3) 1 and 4

(4) 1 and 3

The production of an optically active compound from a symmetric molecule without resolution in termed as:

(1) Walden inversion

(2) partial racemisation

(3) asymmetric synthesis

(4) partial resolution

Find the type of isomerism shown by buta-1,3-diene and but-2-yne.

1. Position isomers

2. Functional isomers

3. Chain isomers

4. Tautomers

Find the number of different substitution products possible when ethane reacts with chlorine
in the presence of sunlight.
 

In butane, which of the following forms has the lowest energy?

(1) Gauche form

(2) Eclipsed form

(3) Staggered form

(4) None of these

What is the relationship between the two given molecular structures?