Class 12 Chemistry
Magical Series Assignment
Organic Reasoning – Set 4
Write the reasons for the following …
Q.1. Nitro compounds have high boiling points in comparison with other compounds of same molecular mass.
Q.2. Ethyl amine is soluble in water, whereas aniline is not soluble in water.
Q.3. Primary amines have higher boiling points than tertiary amines.
Q.4. Alkyl amines (methylamine) are more basic than ammonia.
Q.5. Aliphatic amines are stronger bases than aromatic amines.
Q.6. Aniline is a weaker base than cyclohexylamine.
Q.7. Amines are less acidic than alcohols of comparable masses.
Q.8. Amines are more basic than alcohols of comparable masses.
Q.9. pKb value for aniline is more than that of methylamine.
Q.10. Methylamine solution in water reacts with ferric chloride solution to give a precipitate of ferric hydroxide.
Q.11. The two strands of DNA are not identical, but complimentary.
Q.12. When DNA is hydrolysed, the molar ratio between cytosine to guanine is same and similarly adenine to thymine is also same.
Q.13. When RNA is hydrolysed, there is no relationship among the quantities of different bases.
Q.14. Soaps do not work in hard water.
Q.15. Bithional is added to soap.
Q.16. Synthetic detergents are better than soaps.
Q.17. Carbohydrates are generally optically active.
Q.18. Glucose is soluble in water but cyclohexane is not.
Q.19. Aldehyde group is absent in the pentaacetate of D-glucose.
Q.20. The use of the sweetener aspartame is limited in cold foods and drinks.
Q.21. During electrolysis of amino acids in acidic solution, they migrate towards the cathode, while during electrolysis in alkaline solution they migrate towards the anode.
Q.22. Vitamin A is essential for us.
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