Ncert Solutions Chemistry Class 11th
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3.45. Assertion: Hydrogen is placed separately at the top of the Periodic Table.
Reason: It is the lightest element on the periodic table with a weight of just 1.0079 amu.
3.45. Assertion: Hydrogen is placed separately at the top of the Periodic Table.
Reason: It is the lightest element on the periodic table with a weight of just 1.0079 amu.
3.45. (b) It has only ones-electron and hence can be placed in group 1 (alkali metals). It can also gain an electron to achieve a noble gas arrangement and hence it can behave similarly to a group 17 (halogen family) element. Because it is a special case, we shall place hydrogen separately at
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13.21. Write structures of all the alkenes which on hydrogeneration give 2-methylbutane.
13.21. Write structures of all the alkenes which on hydrogeneration give 2-methylbutane.
The basic skeleton structure of 2-methylbutane is
Upvote 13.19. Why does benzene undergo electrophilic substitution reactions easily and nucleophilic substitutions with difficulty?
13.19. Why does benzene undergo electrophilic substitution reactions easily and nucleophilic substitutions with difficulty?
Benzene is a rich source of electrons because of the presence of an electron cloud containing 6 n-electrons above and below the plane of the ring. Consequently, it attracts the electrophiles (electron-deficient) reagents towards it and repels nucleophiles (electron- rich) reagents. As a result, benz
Upvote 3.44. Assertion: Metallic elements have strong tendency to gain electrons.
Reason: Electronegativity is inversely related to the metallic properties of elements.
3.44. Assertion: Metallic elements have strong tendency to gain electrons.
Reason: Electronegativity is inversely related to the metallic properties of elements.
3.44. (d) Assertion is a wrong statement. Non-metallic elements have a strong tendency to gain electrons. Therefore, electronegativity is directly related to those non-metallic properties of elements. It can be further extended to say that the electronegativity is inversely related to the meta
Upvote 13.18. Arrange benzene, n-hexane and ethyne in decreasing order of acidic behaviour. Also give reason for this behaviour.
13.18. Arrange benzene, n-hexane and ethyne in decreasing order of acidic behaviour. Also give reason for this behaviour.
The hybridization state of carbon in these three compounds is:
Upvote 13.17. Write down the products of ozonolysis ofl, 2-dimethylbenzene (o-xylene). How does the result support Kekule structure of benzene?
13.17. Write down the products of ozonolysis ofl, 2-dimethylbenzene (o-xylene). How does the result support Kekule structure of benzene?
o-Xylene may be regarded as a resonance hybrid of the following two Kekule structures. Ozonolysis of each one of these gives two products as shown below:
Upvote 13.16. Addition of HBr to propene yields 2-bromopropane, while in the presence of benzoyl peroxide, the same reaction yields 1-bromopropane. Explain and give mechanism.
13.16. Addition of HBr to propene yields 2-bromopropane, while in the presence of benzoyl peroxide, the same reaction yields 1-bromopropane. Explain and give mechanism.
Addition of HBr to propene is an ionic electrophilic addition reaction in which the electrophile, i.e., H+ first adds to give a more stable 2° carbocation. In the 2nd step, the carbocation is rapidly attacked by the nucleophile Br~ ion to give 2-bromopropane.
Upvote 13.15. What effect does branching of an alkane chain has on its boiling point?
13.15. What effect does branching of an alkane chain has on its boiling point?
Branching of carbon atom chain decreases the boiling point of alkane.
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