Question

Which is the correct synthesis of 6-methyl-3-heptanone from 3-methyl-1-butene? Acid and water, then Cr03/H2SO4, then CH3CH2CH2 MgBr, then acid, then CrOz/H2SO4 Acid and water, then C+03/H2S04, then CH3CH2CH2MgBr, then acid HB:/ROOR, then Mg/ether, then propanal, then acid, then CrO3/H2SO4 HBr, then Mg/ether, then propanal, then acid, then CrOz/H2SO4 Question 21 (4 points) Which of the following statements is true? Aromatic compounds release more energy per pi bond upon saturation than simple alkenes. Aromatic compounds have longer C-C bonds than alkanes. Aromatic compounds release less energy on combustion than aliphatic compounds do. Aromatic compounds react faster than aliphatic compounds in radical halogenation.

Answer 1

1) The reagents are

HBr/ROOR, then Mg/ether,then propanal,then acid,then CrO3/H2SO4

peroxide used to brominate the alkene gives primary bromoalkane. Bromoalkane with Mg gives grignard reagent.Grignard reagent with propanal gives secondary alcohol then Chromic acid oxidises alcohol to ketone.

2) Aromatic compounds release more energy per pi bond upon saturation than simple alkene.

Aromatic compounds are stable than other alkenes( Resonance stabilised).They release more energy upon saturation.

3) L,Hexose,Aldose,4

It has L configuration, having 6 carbons in backbone,and comes under the family aldose and have 4 chiral carbons.

4) It is antiaromatic and has two half filled molecular orbitals.