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Write the structure of the major organic product in each of the Ch 3 Maths Class 10 In Hindi Question following reactions: Ans:. Write the mechanism of the following reaction: Ans: KCN is a resonance hybrid of the following two contributing structures: Thus, CN � ion is an ambident nucleophile.
Since C � C bond is stronger than C � N bond, therefore, attack occurs through C to form n-butyl cyanide. Arrange the compounds of each set in order of reactivity towards S N 2 displacement: i 2-Bromomethyibutane, 1-Bromopentane, 2-Bromopentane.
Ans: The S N 2 reactions reactivity depends upon steric hindrance. More the steric hindrance slower the reaction. In S N 1 reactions, the reactivity depends upon the stability of carbocations. Delhi Ans: The three isomers are position isomers which differ in the relative positions of the chlorine atoms in the ring : As we know, p-isomer is more symmetrical as compared to the other isomers.
This means that in the crystal lattice, molecules of the p-isomers are more closely packed as compared to the other isomers. As a result, it has a higher melting point and lower solubility as compared to ortho and meta isomers. Haloarenes are less polar than haloalkanes and are insoluble in water.
This is because of lack of hydrogen bonding. As a result, the attractive forces in haloarenes�water system remain less than the attractive forces in H20 molecules which are hydrogen bonded. Haloarenes are soluble in organic solvents of low polarity such as benzene, ether, chloroform, carbon tetrachioride etc. The treatment of alkyl chlorides with aqueous KOH leads to the formation of alcohols but in presence of alcoholic KOH, alkenes are major products.
Board , Haryana Board Answer: In aqueous medium i. They being a strong nucleophile, will bring about the substitution of alkyl halides to form alcohols. In other words, in aqueous medium, OH � ions will behave as weak base and elimination leading to alkenes will not be feasible. When a is reacted with sodium metal it give compound d , C 8 H 18 which is different from the compound formed when n-butyl bromide is reacted with sodium. Give the structural formula of a and write the equations for all the reactions.
Ans: i There are two primary alkyl halides having the molecular formula, C 4 H 9 Br. Therefore, compound c is tert-butyl bromide which is an isomer of compound a ,i. Thus a is isobutyl bromide, b is 2-methyl-1 -propane, c is tert-butylbromide, and d is 2,5-dimethylhexane. What happens when. Ans: What will be the colour of the sky, when it is observed from a place in the absence of any atmosphere?
Sky appears dark. Reason: In Ch 2 Maths Class 10 In Hindi Word the absence of atmosphere, there would have been no scattering of sunlight at all. The sky appears dark instead of blue to an astronaut. State its reason. The sky appears dark to the astronaut as scattering does not take place at very high altitude due to the absence of atmosphere. What is myopia near-sightedness? Draw a ray diagram to show how it can be corrected using a lens.
Myopia is the inability of an eye in viewing long distant objects. The image in this case is formed before the retina. For every myopic eye, there exists a far point beyond which clear image cannot be seen. The short-sightedness is corrected by using a concave lens which diverges and shifts the image to the retina. What is hypermetropia far-sighted-ness?
Draw a ray diagram to show how this defect can be corrected using a lens. Hypermetropia is the inability of an eye in viewing the nearby objects. The image in this case is formed beyond the retina. For a hypermetropic eye, there exists a near point. It is corrected by using a convex lens, which converges and shifts the image to the retina. Define the term dispersion of white light.
State the colour which bends i the least and ii the most while passing through a glass prism. The splitting up of white light into its component colours is called dispersion. What is Tyndall effect? The phenomenon of scattering of light by the colloidal particles is called Tyndall effect. Give an example of optical phenomena which occurs in nature due to atmospheric refraction. Twinkling of stars.
Give an example of a phenomenon where Tyndall effect can be observed. When a fine beam of sunlight enters a room containing suspended particles of dust, the path of the beam of light is visible. It is due to the scattering of light Tyndall effect. Name the type of particles which acts as a prism in the formation of rainbow in the sky. Water droplets present in the atmosphere. What is the cause of dispersion of white light on passing through a prism? The refractive index of the material of a prism is different for different colours of light as different colours have different speeds in the material of a prism.
Also, prism has non-parallel surfaces. Name the atmospheric phenomenon due to which the sun can be seen above the horizon about two minutes before actual sunrise. Atmospheric refraction. Give reasons: i The extent of deviation of a ray of light on passing through a glass prism depends on its colour. A star appears slightly higher above than its actual position in the sky. Illustrate it with the help of a labelled diagram.
The gradual change in the refractive index of different layers of the atmosphere due to the varying conditions of it causes atmospheric refraction. When starlight enters the atmosphere, it gets refracted continuously. The higher level of air acts as a rarer medium while the dense air near the surface of earth acts as a denser medium.
So, the atmosphere bends the starlight towards the normal. As a result, the apparent position of star is slightly different from its actual position. Thus, star appears slightly higher above than its actual position in the sky. Mark on it a the incident ray. What should be the type of the corrective lens used?
What would be its power? A concave lens of focal length cm and power � 0. What could be his defect of vision? Draw a ray diagram to illustrate this defect of vision. Name the three common defects of vision. What are their causes? Name the type of lens used to correct each of them.
Which phenomenon is responsible for Ch 1 Maths Class 10 In Hindi World making the path of light visible? Tyndall effect. Chapter 4 - Linear Equations in Two Variables. Chapter 5 - Introductions to Euclids Geometry. Chapter 6 - Lines and Angles. Chapter 7 - Triangles. Chapter 8 - Quadrilaterals. Chapter 9 - Areas of Parallelogram and Triangles. Chapter 10 - Circles. Chapter 11 - Constructions. Chapter 12 - Herons formula. Chapter 13 - Surface area and Volumes.
Chapter 14 - Statistics. Chapter 15 - Probability.
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