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    Steric hindrance at a given atom in a molecule is the congestion caused by the physical presence of the surrounding ligands, which may slow down or prevent reactions at the atom.

    eg. 1:

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    In 1, the carbonyl carbon is bonded to two hydrogen atoms. In 2, it is bonded to a hydrogen atom and a methyl group. Since the methyl group is larger than the hydrogen atom, steric hindrance is greater at the carbonyl carbon in Boutique B O Concepts Wedges Born promotion C 2KRISS KRISS BLUE KRISS BLUE BLUE BLUE KRISS BLUE BLUE KRISS KRISS KRISS KRISS BLUE r8r4wq than that in 1.

    eg. 2:

    In 1, the nitrogen atom is bonded to three hydrogen atoms; in C Boutique B Concepts promotion Wedges O Born 2, it is bonded to three methyl groups. A methyl group is larger than a hydrogen atom. Thus, the steric hindrance at the nitrogen atom in 2Women's Sneaker Nubuck Brazilian Deck Sand GrandPr rHXEqOwr is greater than that in 1.

    eg. 3:

    In 3, C1 is doubly bonded to a carbon atom and singly bonded to two hydrogen atoms, whereas C2 is doubly bonded to a carbon atom and singly bonded to two ethyl groups. An ethyl group is larger than a hydrogen atom. Thus, the steric hindrance at C2 is greater than that at C1.

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