객관식
Which of the following best describes the Lewis structure of (methane)?
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1. A Review of General Chemistry
Lewis Structure
객관식
Which of the following best describes the correct Lewis structure for glycine ()?
A
The molecule has a central carbon atom bonded to an amino group (), a carboxyl group (), a hydrogen atom, and another hydrogen atom, with all atoms obeying the octet rule and no formal charges.
B
The molecule consists of a central carbon atom bonded to three hydrogens and a carboxyl group, with the amino group attached to the carboxyl carbon.
C
The molecule has a central nitrogen atom bonded to two hydrogens, a carboxyl group, and a methyl group, with the carbonyl carbon having a triple bond to oxygen.
D
The molecule has a central carbon atom bonded to two carboxyl groups and two hydrogen atoms, with the amino group attached to one of the carboxyl groups.
검증된 단계별 안내1
Identify the molecular formula and functional groups of glycine: it contains an amino group (NH\_2), a carboxyl group (COOH), and a central carbon atom (the alpha carbon) bonded to these groups and hydrogens.
Recall that in amino acids like glycine, the central carbon (alpha carbon) is typically bonded to four substituents: an amino group, a carboxyl group, a hydrogen atom, and another hydrogen atom (since glycine is the simplest amino acid).
Draw the central carbon atom and attach the amino group (NH\_2) to it with a single bond, ensuring nitrogen has a lone pair and obeys the octet rule.
Attach the carboxyl group (COOH) to the central carbon with a single bond; within the carboxyl group, draw a carbon double bonded to one oxygen and single bonded to a hydroxyl group (OH), making sure all atoms satisfy the octet rule.
Add the remaining two hydrogen atoms bonded to the central carbon, and verify that all atoms have complete octets and that there are no formal charges, confirming the correct Lewis structure for glycine.
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