Chemistry-
General
Easy
Question
The following reaction is known as 
- Perkin reaction
- Gattermann reaction
- Kolbe reaction
- Gattermann-aldehyde reaction
The correct answer is: Gattermann-aldehyde reaction
In the presence of anhydrous 
phenol form salicyladehyde. It is Gattermann-aldehyde reaction.
Related Questions to study
chemistry-
On heating glycerol with conc.
a compound is obtained which has bad odour. The compound is:
On heating glycerol with conc. a compound is obtained which has bad odour. The compound is:
chemistry-General
chemistry-
On conversion into the Grignard reagent followed by treatment with absolute ethanol, how many isomeric alkyl chlorides would yield 2-methylbutane?
On conversion into the Grignard reagent followed by treatment with absolute ethanol, how many isomeric alkyl chlorides would yield 2-methylbutane?
chemistry-General
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What is formed when glycerol reacts with excess of HI?
What is formed when glycerol reacts with excess of HI?
chemistry-General
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General formula for alcohols is:
General formula for alcohols is:
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Which of the following compounds is weakest acid?
Which of the following compounds is weakest acid?
chemistry-General
physics-
Assertion :We cannot produce a real image by plane or convex mirrors under any circumstances
Reason : The focal length of a convex mirror is always taken as positive
Assertion :We cannot produce a real image by plane or convex mirrors under any circumstances
Reason : The focal length of a convex mirror is always taken as positive
physics-General
chemistry-
An organic compound reacts with 
to give. The compound with sodium metal gives 
An organic compound reacts with to give. The compound with sodium metal gives
chemistry-General
maths-
If f : R → R is continuous and differentiable function such that 
f(t) dt + f¢¢¢ (3) 
t3
dt – f ¢ (1) 
t2 dt + f ¢¢ (2) 
t. dt, then the value of f ¢ (4) is :
If f : R → R is continuous and differentiable function such that f(t) dt + f¢¢¢ (3) t3
dt – f ¢ (1) t2 dt + f ¢¢ (2) t. dt, then the value of f ¢ (4) is :
maths-General
physics-
Assertion : The refractive index of diamond is 
and that of liquid is 
If the light travels from diamond to the liquid, it will totally reflected when the angle of incidence is 30o
Reason :
where 
is the refractive index of diamond with respect to liquid
Assertion : The refractive index of diamond is and that of liquid is
If the light travels from diamond to the liquid, it will totally reflected when the angle of incidence is 30o
Reason : where is the refractive index of diamond with respect to liquid
physics-General
maths-
If f : [0, p] → R is continuous and 
f(x) sin x dx = f(x) cos x dx = 0, then the number of roots of f(x) in (0, p) is
If f : [0, p] → R is continuous and f(x) sin x dx = f(x) cos x dx = 0, then the number of roots of f(x) in (0, p) is
maths-General
physics-
Assertion : Different colours travel with different speed in vacuum
Reason : Wavelength of light depends on refractive index of medium
Assertion : Different colours travel with different speed in vacuum
Reason : Wavelength of light depends on refractive index of medium
physics-General
chemistry-
The following substance can be used as a raw material for obtaining alcohol:
The following substance can be used as a raw material for obtaining alcohol:
chemistry-General
chemistry-
Etherates are
Etherates are
chemistry-General
chemistry-
chemistry-General
chemistry-
Lucas reagent produces cloudiness immediately with:
Lucas reagent produces cloudiness immediately with:
chemistry-General
