7.50 draw all constitutional isomers with the molecular formula c4h9br, and then arrange them in order of: (a) increasing reactivity toward an sn2 reaction. (b) increasing reactivity toward an e2 reaction

Isomers are:

2-bromobutane (I)

2-bromo-2-methylpropane (II)

1-bromo-2-methylpropane (III)

1-bromobutane (IV)

for SN2 reaction :

IV > III > I > II

for E2 reaction is:

IV < III < I < II

Explanation:

The constitutional isomers are (structures are shown if figure):

2-bromobutane (I)

2-bromo-2-methylpropane (II)

1-bromo-2-methylpropane (III)

1-bromobutane (IV)

For SN2 reaction : the order of reactivity of alkyl halides is

tertiary < secondary < primary

For E2 reaction: the order of reactivity of alkyl halides is

tertiary > secondary > primary

Thus the order of reactivity for SN2 reaction is:

IV > III > I > II

The order of reactivity for E2 reaction is:

IV < III < I < II

explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.