Free Alkyl Halides MCQs with Answers
22 Alkyl Halides MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
22 questions · page 3 of 3
21. Conversion of dihaloalkane into alkyne does not involve
- A. Addition
- B. Elimination
- C. Base
- D. Heat
Explanation: A vicinal dihalide is converted to an alkyne by removing two molecules of hydrogen halide with hot alcoholic potassium hydroxide, which is a double dehydrohalogenation and therefore an elimination. Addition is the opposite process and would move back towards the saturated compound. The base and the heat are both required conditions for the elimination.
Correct answer: Addition22. IUPAC name of (CH3)3CCH2Br is
- A. 1-bromopentane
- B. 1-bromo-2,2,2-trimethylethane
- C. 1-bromo-2,2-dimethylpropane
- D. 2-bromopentane
Explanation: The longest chain containing the bromine has three carbons, giving propane, with the bromine on carbon 1 and two methyl groups on carbon 2. Counting all five carbons as a straight chain gives the pentane answers, which ignores the branching. Numbering must start from the end nearer the substituent, which puts the bromine at position 1.
Correct answer: 1-bromo-2,2-dimethylpropane