Question

Question #281de

Answer 1

Alkenyl radicals with formula C4H7 are seven

Explanation:

Consider first the alkenes with formula C4H8:
They are
1) H2C=CH-CH2-CH3
2) H3C-CH=CH-CH3
3) H2C=C(CH3)2

From 1 there are three radicals possibles:

1a) H2C=CH-CH2-CH2
1b) H2C=CH-CH-CH3
1c) H2C=C*-CH2-CH3

From 2 the possibilities are:

2a) H3C-CH=CH-CH2
2b) H3C-CH=C-CH3

From 3:

3a) `"H"_3"C-C=CH"_2`
`"color(white)(mmmmll)|`
`color(white)(mmmml)"CH"_2"*"`

3b) `"H"_3"C-C=CH*"`
`color(white)(mmmmll)|`
`color(white)(mmmml)"CH"_3`

In total seven radicals

Answer 2

I count ten alkenyl radicals with the formula `"C"_4"H"_7`.

Explanation:

From but-1-ene

1. `"H"stackrelcolor(blue)(bb·)("C")"=CHCH"_2"CH"_3`

2. `"H"_2"C="stackrelcolor(blue)(bb·)("C")"CH"_2"CH"_3`

3. `"H"_2"C=CH"stackrelcolor(blue)(bb·)("C")"HCH"_3`

4. `"H"_2"C=CHCH"_2stackrelcolor(blue)(bb·)("C")"H"_2`

From but-2-ene

5. and 6. `stackrelcolor(blue)(bb·)("C")"H"_2"CH=CHCH"_3` (`E"-"` and `Z"-"`isomers)

7. and 8. `"CH"_3stackrelcolor(blue)(bb·)("C")"=CHCH"_3` (`E"-"` and `Z"-"`isomers)

From 2-methylpropene

9. `stackrelcolor(blue)(bb·)("C")"H"_2"C"("CH"_3)"=CH"_2`

10. `("CH"_3)_2"C="stackrelcolor(blue)(bb·)("C")"H"`