Chemistry-
Which of the following compounds is weakest acid?
Chemistry-General
Answer:The correct answer is: Electron withdrawing groups (like 
increase the acidity of phenols by stabilising corresponding phenoxide ion. The effect of 
group will beminimum at m-position due to lack of increased delocalisation of electrons in it. Hence, m-nitrophenol is the weakest acid among these.
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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
chemistry-
General formula for alcohols is:
General formula for alcohols is 
Primary alcohols have 
Secondary Alcohols have 
and tertiary alcohols have 
Primary alcohols have Secondary Alcohols have and tertiary alcohols have General formula for alcohols is:
chemistry-General
General formula for alcohols is Primary alcohols have Secondary Alcohols have and tertiary alcohols have
Primary alcohols have Secondary Alcohols have and tertiary alcohols have 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
chemistry-
What is formed when glycerol reacts with excess of HI?
When glycerol reacts with HI
iodide is obtained
iodide is obtainedWhat is formed when glycerol reacts with excess of HI?
chemistry-General
When glycerol reacts with HI iodide is obtained
iodide is obtainedchemistry-
On conversion into the Grignard reagent followed by treatment with absolute ethanol, how many isomeric alkyl chlorides would yield 2-methylbutane?
Thus,
On conversion into the Grignard reagent followed by treatment with absolute ethanol, how many isomeric alkyl chlorides would yield 2-methylbutane?
chemistry-General
Thus,
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
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
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 reaction is known as 
In the presence of anhydrous 
phenol form salicyladehyde. It is Gattermann-aldehyde reaction.
phenol form salicyladehyde. It is Gattermann-aldehyde reaction.The following reaction is known as
chemistry-General
In the presence of anhydrous phenol form salicyladehyde. It is Gattermann-aldehyde reaction.
phenol form salicyladehyde. It is Gattermann-aldehyde reaction.chemistry-
At 530 K, glycerol reacts with oxalic acid to produce
Oxalic acid on reaction with glycerol at 530K temperature furnishallyl alcohol.
At 530 K, glycerol reacts with oxalic acid to produce
chemistry-General
Oxalic acid on reaction with glycerol at 530K temperature furnishallyl alcohol.
chemistry-
The conversion of m-nitrophenol to resorcinol involves respectively
The conversion of m-nitrophenol to resorcinol involves respectively
chemistry-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-
The alcohol that produces turbidity immediately with 
at room temperature
is known as Lucas reagent. Lucas test is used for the distinction between primary, secondary and tertiary alcohols.The tertiary alcohol reacts immediately with Lucas reagent producing turbidity. The secondary alcohol gives turbidity within 5-10 min and primary alcohol doesn’t give turbidity at all at room temperature. In the given alternates, 2-hydroxy-2-methyl propane is
alcohol, so it is more reactive.The alcohol that produces turbidity immediately with at room temperature
chemistry-General
is known as Lucas reagent. Lucas test is used for the distinction between primary, secondary and tertiary alcohols.The tertiary alcohol reacts immediately with Lucas reagent producing turbidity. The secondary alcohol gives turbidity within 5-10 min and primary alcohol doesn’t give turbidity at all at room temperature. In the given alternates, 2-hydroxy-2-methyl propane is
alcohol, so it is more reactive.