The Student Room Group

chemistry questions

Could someone help me with these questions please:

What safety precautions in addition to wearing eye protection must be taken when adding concentrated sulphuric acid (to propanone and potassium dichromate)

What is the difference between propanone and propan-2-ol and what homologous series do they belong to?

Identify the reagent and conditions necessary for conversion of iodoethane to ethylamine, C2H5NH2

State why the rate of reaction would be slower if bromobutane were used in place of iodoethane, with all other conditions remaining the same.

Thank you

Reply 1

Ashtray88
Could someone help me with these questions please:

What safety precautions in addition to wearing eye protection must be taken when adding concentrated sulphuric acid (to propanone and potassium dichromate)

What is the difference between propanone and propan-2-ol and what homologous series do they belong to?

Identify the reagent and conditions necessary for conversion of iodoethane to ethylamine, C2H5NH2

State why the rate of reaction would be slower if bromobutane were used in place of iodoethane, with all other conditions remaining the same.

Thank you

1) Wear gloves (acid corrosive)
2) Propanone is a ketone, Propan-2-ol an alcohol
3) Reagents = Ammonia Conditions = Heat excess of concentrated solution of ammonia in ethanol with the haloalkane in a sealed tube.
4) In bromobutane the C-Br bond strength is weak (weaker bond enthalpy since its a shorter bond than C-I) thus the higher the activation energy, the slower the rate of reaction.

Reply 2

Thank you very much, i realised I knew the answer to the first question anyway, I was expecting there to be other reasons but it's only a one mark answer so it must just be wearing gloves

Reply 3

Ashtray88
Thank you very much, i realised I knew the answer to the first question anyway, I was expecting there to be other reasons but it's only a one mark answer so it must just be wearing gloves

No problem :smile: