Which one is most reactive towards nucleophilic addition reaction?

1.       2.

 

3.           4.

The radical  is aromatic because it has:

1. 6 p-orbitals and 6 unpaired electrons

2. 7 p-orbitals and 6 unpaired electrons

3. 7 p-orbitals and 7 unpaired electrons

4. 6 p-orbitals and 7 unpaired electrons

Which of the following does not exhibit optical isomerism?

(1) Maleic acid      

(2) α-amino acids

(3) Lactic acid       

(4) Tartaric acid

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

Liquid hydrocarbons can be converted to a mixture of gaseous hydrocarbons by:-

1. Oxidation
2. Cracking
3. Distillation under reduced pressure
4. Hydrolysis

Which one of the following has the most acidic nature?

1. 

2. 

3. 

4. 

The stability of carbanions in the following

is in the order of

(a) (1)>(2)>(3)>(4)

(b) (2)>(3)>(4)>(1)

(c) (4)>(2)>(3)>(1)

(d) (1)>(3)>(2)>(4)

The IUPAC name of is

(a) 3, 4-dimethylpentanoyl chloride

(b) 1-chloro-1-oxo-2, 3-dimethylpentane

(c) 2-ethyl-3-methylbutanoyl chloride

(d) 2, 3-dimethylpentanoyl chloride

The Lassaigne's extract is boiled with conc. $HN{O}_3$  while testing for the halogens. By doing so it :-

(1) decomposes $N{a}_{2}S$ and NaCN, if formed

(2) helps in the precipitation of AgCl

(3) increases the solubility product of AgCl

(4) increases the concentration of $N{O}_3^{-}$ ions

Ether and benzene can be separated by-
1. Filtration
2. Distillation
3. Crystallization
4. Sublimation