“All similar triangles are congruent”

Joey scored 75, 80,76,85 and 90 in five subjects out 100 each. Calculate his percentage?

1. 89%
2. 80%
3. 81.2%
4. 80.3%

Find the number by which 7:21 is multiplied to make it equivalent to 84 : 252.

1. 14
2. 12
3. 11
4. 13

the reagents used in the conversion are:

1.    
2.    
3. none of the above    
4.    

Which is the correct order of acidity from weakest to strongest acid for these compounds:
I) CF₃CH₂OH
II)
III)
IV)

1. I<IV<III<II    
2. II<III<I<IV    
3. IV<I<III<II    
4. III<IV<I<II    

Two aliphatic aldehydes P and Q react in the presence of aqueous K₂CO₃ to give compound R, which upon treatment with HCN provides compound S On acidification and heating S gives the product shown below:

The compound P and Q respectively are :

1.  and 
2.  and 
3.  and 
4.  and 

A tertiary alcohol H on acid catalysed dehydration gives a product I. Ozonolysis of I leads to compounds J and K. Compound J upon reaction with KOH gives benzyl alcohol and a compound L, whereas K on reaction with KOH gives only M

The structures of compounds J, K and L, respectively, are:

1. and    
2. and    
3. and    
4. and    

A tertiary alcohol H on acid catalysed dehydration gives a product I. Ozonolysis of I leads to compounds J and K. Compound J upon reaction with KOH gives benzyl alcohol and a compound L, whereas K on reaction with KOH gives only M

The structure of compound I is:

A tertiary alcohol H on acid catalysed dehydration gives a product I. Ozonolysis of I leads to compounds J and K. Compound J upon reaction with KOH gives benzyl alcohol and a compound L, whereas K on reaction with KOH gives only M

Compound H is formed by the reaction of:

1. + PhCH₂MgBr    
2. +PhMgBr    
3. +PhCH₂MgBr    
4.    

Aldehydes undergo disproportionation reaction in presence of aqueous NaOH Simultaneous oxidation and. reduction 'of a compound is scientifically called as disproportionation.
Aldehydes having no a-hydrogen show this reaction called Cannizzaro's reaction. Few exceptions are also there to this generalization.
The reaction may be represented as:

Intramolecular Cannizzaro's reaction is also possible.

Which of the following' compounds gives internal crossed Cannizzaro's reaction?

Aldehydes undergo disproportionation reaction in presence of aqueous NaOH Simultaneous oxidation and. reduction 'of a compound is scientifically called as disproportionation.
Aldehydes having no a-hydrogen show this reaction called Cannizzaro's reaction. Few exceptions are also there to this generalization.
The reaction may be represented as:

Intramolecular Cannizzaro's reaction is also possible.

The aldehyde having -hydrogen which gives Cannizzaro's reaction is:

Aldehydes undergo disproportionation reaction in presence of aqueous NaOH Simultaneous oxidation and. reduction 'of a compound is scientifically called as disproportionation.
Aldehydes having no a-hydrogen show this reaction called Cannizzaro's reaction. Few exceptions are also there to this generalization.
The reaction may be represented as:

Intramolecular Cannizzaro's reaction is also possible.

The aldehyde which shows Cannizzaro's reaction is:

1.    
2. HCHO    
3.    
4. all of these    

The final product (III) obtained in the reaction, is:

Tishchenko reaction of gives:

Identity the product(s):

1.    
2.    
3.    
4. both (a) and (b)    

In the reaction, X is:

1. O₃    
2. HNO₃    
3. KMnO₄    
4. O₂