Which of the following is not chiral?

1. 2-butanol

2. 2,3-dibromopentane

3. 3-bromopentane

4. 2-hydroxypropanoic acid

The order of decreasing reactivity towards an electrophilic reagent, for the following : 
(i) Benzene (ii) Toluene 
(iii) Chlorobenzene and 
(iv) Phenol 
Would be :

1. (i) > (ii) > (iii) > (iv)

2. (ii) > (iv) > (i) > (iii)

3. (iv) > (iii) > (ii) > (i)

4. (iv) > (ii) > (i) > (iii)

Which of the following compounds will exhibit cis-trans (geometrical) isomerism?

1. 2-butene

2. Butanol

3. 2-butyne

4. 2-butenol

The IUPAC name of the compound having the formula CH≡C–CH=CH₂ is :

1. 3-Butene-1-yne

2. 1-Butyn-3-ene

3. But-1-yne-3-ene

4.  Buten-3-yne

Decreasing order of acidic character for cyclohexanol (I), acetic acid (II), 2, 4, 6-trinitrophenol (III) and phenol (IV),  will be

1. III>II>IV>I

2. II>III>I>IV

3. II>III>IV>I

4. III>IV>II>I

Which one of the following is most reactive towards electrophilic reagent?

1.  

2.  

3.  

4.  

The correct order of increasing bond length of 
C-H, C-O, C-C and C=C is

1.  $\mathrm{C}-\mathrm{C}<\mathrm{C}=\mathrm{C}<\mathrm{C}-\mathrm{O}<\mathrm{C}-\mathrm{H}$

2.  $\mathrm{C}-\mathrm{O}<\mathrm{C}-\mathrm{H}<\mathrm{C}-\mathrm{C}<\mathrm{C}=\mathrm{C}$

3.  $\mathrm{C}-\mathrm{H}<\mathrm{C}-\mathrm{O}<\mathrm{C}-\mathrm{C}<\mathrm{C}=\mathrm{C}$

4.  $\mathrm{C}-\mathrm{H}<\mathrm{C}=\mathrm{C}<\mathrm{C}-\mathrm{O}<\mathrm{C}-\mathrm{C}$