What ester produces a white crystalline acid when boiled with KOH, cooled, and acidified with conc. HCl?

1. Methyl acetate 

2. Ethyl acetate

3. Ethyl formate 

4. Ethyl benzoate

The compound formed when malonic acid heated with urea, is                  

1. cinnamic acid

2. butyric acid

3. barbituric acid

4. crotonic acid

The dihedral angle between two C-H bonds in the staggered conformation of ethane  is            

1. 60$°$ 

2. 180$°$

3. 0$°$ 

4. 120$°$

Number of monochlorinated products (excluding stereo-isomers) obtained from the given reaction are :

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

1. but-2-ene                             

2. Butanol

3. but-2-yne                             

4. buten-2-ol   

An alkane can form Structural isomers if the number of carbon atoms is-

1. $\ge$1                                 

2. $\ge$2

3. $\ge$3                                   

4. $\ge$4

Isomerism exhibited by acetic acid and methyl formate is:
1. Functional
2. Chain
3. Geometrical
4. Central 

Which one of the following pairs represents stereoisomerism?                                     

1. Chain isomerism and rotational isomerism

2. Structural isomerism and geometrical isomerism

3. Linkage isomerism and geometrical isomerism

4. Optical isomerism and geometrical isomerism

A racemic mixture is formed by mixing two:

1. Isomeric compounds             

2. Chiral compounds

3. Meso compounds                       

4. Enantiomers

Which of the following acid does not exhibit optical isomerism?

1. Maleic acid                           
2. $\mathrm{\alpha }$-amino acid

3. Lactic acid                             
4. Tartaric acid