The \(C - H\) bond distance is longer in - 

1.	\(C_2H_2\)	2.	\(C_2H_4\)
3.	\(C_2H_6\)	4.	\(C_2H_2Br_2\)

The number of primary amines of the formula ${\mathrm{C}}_4{\mathrm{H}}_{11}\mathrm{N}$ are :

An isomer of ethanol is-

The compounds that show geometrical isomerism among the following are:

a. 2-Butene

b. Propene

c. 1-Phenylpropene

d. 2-Methylbut-2-ene

1. a, b

2. c, d

3. a, b, c

4. a, c

Paper chromatography is an example of-

1. Partition chromatography

2. Thin layer chromatography

3. Column chromatography

4. Adsorption chromatography

 

1. 2–Bromo-3–methylbutanoic acid

2. 2-Methyl-3-bromobutanoic acid

3. 3-Bromo-2-methylbutanoic acid

4. 3-Bromo-2,3-dimethylpropanoic acid.

Compare the stability of the two resonating structures given below and mark the correct option:

1. (I)  is more stable than (II)

2. (II) is more stable than (I)

3. (I) and (II) both have the same stability 

4. None of the above

The effect that makes 2,3–dimethyl-2-butene more stable than 2-butene is-

1. Resonance

2. Hyperconjugation

3. Steric effect

4. Inductive effect

0.284 g of an organic substance gave 0.287 g AgCl in a carius method for the estimation of halogen. The percentage of Cl in the compound is-

1. 5%

2. 18%

3. 25%

4. 33%

The latest technique for isolation, purification and separation of organic compounds is -

1. Crystallisation

2. Distillation

3. Sublimation

4. Chromatography