Physics-
A ray of light passes through four transparent media with refractive indices
as shown in the figure. The surfaces of all media are parallel. If the emergent ray CD is parallel to the incident ray AB, we must have

Physics-General
Answer:The correct answer is:
For successive refraction through different media
constant. Here as
is same in the two extreme media,
.
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chemistry-
The acidic character of
alcohols,
and
is of the order
Alcohols are more acidic than alkynes but less acidic than water thus, the correct order of acidity is 
The acidic character of
alcohols,
and
is of the order
chemistry-General
Alcohols are more acidic than alkynes but less acidic than water thus, the correct order of acidity is 
physics-
A fish is a little away below the surface of a lake. If the critical angle is
, then the fish could see things above the water surface within an angular range of
where

From figure given in question 
A fish is a little away below the surface of a lake. If the critical angle is
, then the fish could see things above the water surface within an angular range of
where

physics-General
From figure given in question 
physics-
A ray of light is incident at an angle i from denser to rare medium. The reflected and the refracted rays are mutually perpendicular. The angle of reflection and the angle of refraction are respectively r and r’, then the critical angle will be

A ray of light is incident at an angle i from denser to rare medium. The reflected and the refracted rays are mutually perpendicular. The angle of reflection and the angle of refraction are respectively r and r’, then the critical angle will be

physics-General
chemistry-
Ethanol is more soluble in water but ether is less soluble because:
Both shows H-bonding, however the increase in hydrophobic character (due to two alkyl groups in ether), the H-bonding weakens.
Ethanol is more soluble in water but ether is less soluble because:
chemistry-General
Both shows H-bonding, however the increase in hydrophobic character (due to two alkyl groups in ether), the H-bonding weakens.
chemistry-
How many structural isomers are known for 
4 alcohols (butan-1-ol; butan-2-ol; 2-methyl butan-1-ol; 2-methyl butan-2-ol) and 3 ethers (diethyl ether, methyl-propyl ether and methyl isopropyl ether).
How many structural isomers are known for 
chemistry-General
4 alcohols (butan-1-ol; butan-2-ol; 2-methyl butan-1-ol; 2-methyl butan-2-ol) and 3 ethers (diethyl ether, methyl-propyl ether and methyl isopropyl ether).
chemistry-
Methanol and ethanol can be distinguished by the following:
Methanol and ethanol can be distinguished by the following:
chemistry-General
chemistry-
An alcohol on alk.
oxidation gives first acetone and on further oxidation acetic acid. It is:
An alcohol on alk.
oxidation gives first acetone and on further oxidation acetic acid. It is:
chemistry-General
chemistry-
The alcohol that produces turbidity immediately with
at room temperature
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
The alcohol that produces turbidity immediately with
at room temperature
chemistry-General
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
chemistry-
The conversion of m-nitrophenol to resorcinol involves respectively
The conversion of m-nitrophenol to resorcinol involves respectively
chemistry-General
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.

physics-
White light is incident on the interface of glass and air as shown in the figure. If green light is just totally internally reflected then the emerging ray in air contains

Yellow, orange and red have higher wavelength than green, so m will be less for these rays, consequently critical angle for these rays will be high, hence if green is just totally internally reflected then yellow, orange and red rays will emerge out.
White light is incident on the interface of glass and air as shown in the figure. If green light is just totally internally reflected then the emerging ray in air contains

physics-General
Yellow, orange and red have higher wavelength than green, so m will be less for these rays, consequently critical angle for these rays will be high, hence if green is just totally internally reflected then yellow, orange and red rays will emerge out.
chemistry-
The following reaction is known as 
In the presence of anhydrous
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.
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?
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,
chemistry-
What is formed when glycerol reacts with excess of HI?
When glycerol reacts with HI
iodide is obtained

What is formed when glycerol reacts with excess of HI?
chemistry-General
When glycerol reacts with HI
iodide is obtained
