Spot the false claim

Exercise and reference answers

Questions

1. False statement

   The C to Cl bond is longer in a haloarene than in a haloalkane.

   Statements

   1. In a haloarene the halogen sits on an sp2 hybridised carbon.
   2. Resonance gives the C to Cl bond of a haloarene partial double bond character.
   3. The C to Cl bond is longer in a haloarene than in a haloalkane.

2. False statement

   A phenyl cation is stabilised by resonance, so haloarenes follow SN1 easily.

   Statements

   1. A phenyl cation is stabilised by resonance, so haloarenes follow SN1 easily.
   2. Chlorobenzene becomes phenol with aqueous NaOH at 623 K and 300 atmospheres.
   3. A nitro group at the ortho position raises the reactivity of a haloarene.

3. False statement

   2-Bromopentane gives pent-1-ene as the major alkene on dehydrohalogenation.

   Statements

   1. Alcoholic KOH pulls hydrogen from the beta carbon of a haloalkane.
   2. 2-Bromopentane gives pent-1-ene as the major alkene on dehydrohalogenation.
   3. Zaitsev's rule picks the alkene with more alkyl groups on the doubly bonded carbons.

Instructions

Tap the one statement in each trio that is false.

Explanation