1. Which of the following compounds will have the highest dipole moment?
Answer:
Explanation:
Fluorine is highly electronegative, leading to a significant charge separation and a higher dipole moment in CH3F.
2. Which of the following is not a method for the preparation of haloalkanes?
Answer:
Explanation:
Haloalkanes are not typically prepared directly from esters.
3. Which type of isomerism is shown by 1-chloropropane and 2-chloropropane?
Answer:
Explanation:
Both compounds have the same molecular formula but different positions of the chlorine atom.
4. Which of the following reactions involves the formation of a carbocation intermediate?
Answer:
Explanation:
The SN1 reaction involves the formation of a carbocation intermediate.
5. What product is formed when ethyl chloride reacts with sodium metal?
Answer:
Explanation:
The Wurtz reaction between ethyl chloride and sodium produces ethane.
6. Which reagent is used to convert alcohols to haloalkanes?
Answer:
Explanation:
Thionyl chloride (SOCl2) is commonly used to convert alcohols to chloroalkanes.
7. What type of reaction does bromobenzene undergo with magnesium metal in dry ether?
Answer:
Explanation:
Bromobenzene reacts with magnesium in dry ether to form phenylmagnesium bromide, a Grignard reagent.
8. Which of the following is a nucleophile?
Answer:
Explanation:
Br− has a lone pair of electrons which can be donated, making it a nucleophile.
9. Which of the following halogens is most reactive in electrophilic aromatic substitution reactions?
Answer:
Explanation:
Due to its high reactivity, fluorine is most reactive in electrophilic aromatic substitution reactions.
10. The hydrolysis of haloalkanes to alcohols is an example of which type of reaction?
Answer:
Explanation:
The hydrolysis of haloalkanes to produce alcohols involves nucleophilic substitution.
11. What is the product when chlorobenzene is treated with aqueous sodium hydroxide at 623 K and 300 atm pressure?
Answer:
Explanation:
Under these conditions, chlorobenzene is hydrolyzed to phenol.
12. Which of the following halides will react most rapidly in an SN2 reaction?
Answer:
Explanation:
Methyl halides are least hindered and thus react most rapidly in SN2 reactions.
13. In the presence of sunlight, chlorine reacts with methane to form:
Answer:
Explanation:
Chlorination of methane in the presence of sunlight can lead to the formation of a mixture of products, including methyl chloride, methylene chloride, and chloroform.
14. What is the IUPAC name of CH3-CH2-CH2-Br?
Answer:
Explanation:
According to IUPAC nomenclature, the compound is named as 1-Bromopropane.
15. What is the primary product when 2-bromo-2-methylbutane reacts with ethanolic potassium hydroxide?
Answer:
Explanation:
The reaction involves elimination to form the more substituted alkene, which is 2-Methyl-2-butene.
16. Which of the following haloalkanes will undergo racemization when reacted with a base?
Answer:
Explanation:
Chiral haloalkanes like 2-Chlorobutane undergo racemization in the presence of a base.
17. Which compound will not give a precipitate with AgNO3 solution?
Answer:
Explanation:
Vinyl halides do not typically undergo nucleophilic substitution reactions to give precipitates with AgNO3.
18. Haloarenes are less reactive towards nucleophilic substitution due to:
Answer:
Explanation:
The partial double bond character of the C-X bond in haloarenes due to resonance makes them less reactive towards nucleophilic substitution.
19. Which of the following compounds will have the shortest C-X bond length?
Answer:
Explanation:
Fluorine is the smallest halogen, and the C-F bond will be shorter than the bonds with the other halogens.
20. Which of the following reactions will give 2,2,2-trifluoroethanol as the main product?
Answer:
Explanation:
The hydrolysis of 2,2,2-trifluoroethyl fluoride will lead to the formation of 2,2,2-trifluoroethanol.