alleryA haloalkane heated with alcoholic KOH mainly gives what?
- An alcohol
- An alkene
- An ether
- An alkyne
Show answer and solution
Correct answer: B. An alkene
Alcoholic KOH removes a beta hydrogen and the halogen, forming an alkene.
NEET UG Haloalkanes and Haloarenes — practice questions — page 3
Explore 92 free Haloalkanes and Haloarenes questions in NEET UG Chemistry. Open each question or exercise to read its content, reference answers and available explanation.
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Showing questions 61–90 of 92.
A haloalkane heated with alcoholic KOH mainly gives what?Read the answer and worked solution →By Zaitsev's rule, which alkene is the preferred elimination product?Read the answer and worked solution →2-Bromopentane with alcoholic KOH gives which major product?Read the answer and worked solution →A bulky base meets an alkyl halide with beta hydrogens. What is favoured?Read the answer and worked solution →Grignard reagents are made by reacting haloalkanes with what?Read the answer and worked solution →Why must even traces of moisture be kept away from a Grignard reagent?Read the answer and worked solution →Bromoethane reacts with sodium in dry ether. Which alkane forms?Read the answer and worked solution →An alkyl halide and an aryl halide with sodium in dry ether give an alkylarene. Name it.Read the answer and worked solution →Resonance makes aryl halides unreactive to nucleophiles. How?Read the answer and worked solution →What is the approximate C-Cl bond length in a haloarene?Read the answer and worked solution →Why is the SN1 mechanism ruled out for haloarenes?Read the answer and worked solution →Chlorobenzene is turned into phenol with aqueous NaOH under which conditions?Read the answer and worked solution →A nitro group at which position has no effect on haloarene reactivity?Read the answer and worked solution →In electrophilic substitution, a halogen on benzene behaves as what?Read the answer and worked solution →In chlorobenzene, which effect controls where a new group enters?Read the answer and worked solution →Which polyhalogen compound is widely used as a paint remover?Read the answer and worked solution →Chloroform slowly oxidises in air and light to which poisonous gas?Read the answer and worked solution →Iodoform's antiseptic action is actually due to what?Read the answer and worked solution →Freons are chlorofluorocarbons of which hydrocarbons?Read the answer and worked solution →What is the molecular formula of Freon 12?Read the answer and worked solution →Freon 12 is manufactured by the Swarts reaction starting from what?Read the answer and worked solution →Many fluoroalkanes boil lower than their non-fluorinated analogues. Why?Read the answer and worked solution →The ozone-depleting ability of CFCs arises from what?Read the answer and worked solution →Geminal dihalides treated with strong bases can give which species?Read the answer and worked solution →Haloalkanes react with lithium metal to give what?Read the answer and worked solution →A reaction keeps its configuration at a stereocentre when which holds?Read the answer and worked solution →In the SN2 transition state of CH3Cl and OH-, the three C-H bonds lie where?Read the answer and worked solution →Haloalkanes heated with aqueous hydroxide mainly undergo what?Read the answer and worked solution →Haloalkanes react with ammonia to give which compounds?Read the answer and worked solution →Which compound is a popular methylating agent in organic synthesis?Read the answer and worked solution →
Worked practice questions
By Zaitsev's rule, which alkene is the preferred elimination product?
- One with fewest alkyl groups
- One with a terminal C=C
- One with most alkyl groups
- One with no alkyl groups
Show answer and solution
Correct answer: C. One with most alkyl groups
Zaitsev's rule favours the alkene with more alkyl groups on the double bond carbons.
2-Bromopentane with alcoholic KOH gives which major product?
- Pent-1-ene
- Pentan-2-ol
- Pent-1-yne
- Pent-2-ene
Show answer and solution
Correct answer: D. Pent-2-ene
Pent-2-ene is the more substituted alkene, so Zaitsev's rule makes it the major product.
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