Which of the following structures are possible, given the...

Which of the following structures are possible, given the numbers of bonds that various atoms normally form? (a) $\mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{3}$ (b) $\mathrm{CH}_{3} \mathrm{CHCH}_{2} \mathrm{CH}_{3}$ (c) $\mathrm{CH}_{3} \mathrm{CH}=\mathrm{CHCH}_{2} \mathrm{CH}_{3}$

Which of the following structures are possible, given the numbers of bonds that various atoms normally form?
(a) $\mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{3}$
(b) $\mathrm{CH}_{3} \mathrm{CHCH}_{2} \mathrm{CH}_{3}$
(c) $\mathrm{CH}_{3} \mathrm{CH}=\mathrm{CHCH}_{2} \mathrm{CH}_{3}$

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Key Concepts

Valence of Atoms

This concept refers to the number of chemical bonds an atom typically forms in order to achieve a stable electronic configuration. For example, carbon normally forms four bonds. In the context of evaluating molecular structures, it is crucial to check that each atom (especially carbon in organic molecules) fulfills its standard bonding requirement without overcrowding or under-saturation.

Implicit Bonding and Skeletal Structures

Organic chemists often use skeletal or line-angle formulas to represent compounds, where certain hydrogen atoms are omitted and bond connectivity is implied. Understanding these representations is important to ensure that all atoms are fully satisfied in terms of their bonding even though the diagram might not show all hydrogen atoms explicitly.

Saturation vs. Unsaturation

This concept covers the idea that molecules can be saturated (containing only single bonds) or unsaturated (containing double or triple bonds). Double bonds involve a pair of electrons being shared between two atoms, which affects the overall bonding count of the atoms involved. Recognizing unsaturated bonds is essential to determine whether a given structure obeys the normal bonding patterns of the atoms present.

Transcript

00:01 Okay, so we asked which of the following structures are possible.

00:03 And the first one is two ch2s and a ch3.

00:07 So we need four bonds.

00:11 And as a result, we're going to need three hydrogens on the carbon at the end.

00:23 Because as we can see here, we only have two hydrogen attached to the carbon, and the carbon is also attached to this carbon right here.

00:31 So instead we have three.

00:33 And therefore, the structure couldn't exist.

00:37 I mean, even if we had an alken, it would be ch2, but the interior carbon would be ch.

00:47 And we'd all stroll like this, too.

00:51 This would be, we'd have one hydrogen here because this carbon is bound to this one.

01:00 That's one bond.

01:01 And then this is another bond, three, and then the one hydrogen is the fourth bond.

01:10 So the first one is not possible.

01:22 And then for the second one, we have ch3, ch2, and then.

01:27 Ch3 and this is also not possible either because if we look at carbon 2 in the structure so it's bound to hydrogen it's one bond this carbon is 2 3 but um we only have three bonds so therefore it's not possible we then for c we have this alken 1 2 3 4 5 and the alkenza carbon 2.

02:11 So this can be 2 pentine and it can be drawn like this as well...

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