Trans-2-butene on bromination using CS₂ gives which dibromoderivative

1. (R), (R)-2,3-dibromobutane

2. (S),(S)-2,3-dibromobutane

3. Racemic-2,3-dibromobutane

4. Meso-2,3-dibromobutane

Which of the following carbocations is expected to be most stable?

1. 
2. 
3.  
4. 

A group that deactivates the benzene ring towards electrophilic substitution but which directs the incoming group principally to the o- and p-position is.

1. -NH₂                   
2. -Cl
3. -NO₂                   
4. -C₂H₅

In the given conformation, if C₂ is rotated anticlockwise through an angle of 120° about the C₂–C₃ bond, the resulting conformation will be:

1. Fully eclipsed conformation

2. Partially eclipsed conformation

3. Gauche conformation

4. Staggered conformation

What is the decreasing order of stability of the carbocation ions?

1. I>II>III          

2. II>III>I

3. III>I>II          

4. II>I>III

The most acidic compound among the following is:

The correct order of basicities of the following compounds is:

(1)

(2) ${\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{NH}}_2$

(3) ${\left({\mathrm{CH}}_3\right)}_2\mathrm{NH}$

(4) ${\mathrm{CH}}_3-\stackrel{\stackrel{\mathrm{O}}{\left|\right|}}{\mathrm{C}}-{\mathrm{NH}}_2$

1. 2>1>3>4         

2. 1>3>2>4

3. 3>1>2>4         

4. 1>2>3>4

Consider the acidity of the following carboxylic acids

(i) PhCOOH

(ii) o-NO₂C₆H₄COOH

(iii) p-NO₂C₆H₄COOH

(iv)m-NO₂C₆H₄COOH

1. i>ii>iii>iv

2. ii>iv>iii>i

3. ii>iv>i>iii

4. ii>iii>iv>i

The IUPAC name of   

1. 2,3-diethyl butane

2. 3,4-dimethyl hexane

3. 3-methyl pentane

4. 2-ethyl 3-methyl pentane

Hybridisation of N in pyrrole  is

1. sp                               
2. sp²
3. sp³                             
4. sp³d