CHM 105 Exam 2

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27 Terms

1

Aldehydes oxidize and form…

carboxylic acids

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2

_______ do NOT undergo oxidation.

Ketones

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3

True or False: Tollens’ Test oxidizes both aldehydes and ketones.

False; it only oxidizes aldehydes.

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4

Aldehydes are reduced to ___________.

primary alcohols

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5

Ketones are reduced to ______________.

secondary alcohols

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6

When one alcohol adds to an aldehyde or ketone in the presence of an acid catalyst, the product is a ________.

hemiacetal

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7

Hemiacetals are generally unstable and react with a second molecule of the alcohol to form a stable ________ and water.

acetal

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8

Why are aldehydes more reactive than ketones?

the carbonyl carbon is more positive

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9

An alcohol can add to a cyclic hemiacetal and form a…

cyclic acetal

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10

Can chiral molecules be superimposable?

No

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11

A pair of Fischer projections can be superimposable if…

they both have two of the same substituents

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12

A carbohydrate (such as the open-chain form of D-glucose) that reduces another substance is called a ______ sugar.

reducing

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13

What type of sugar can be oxidized to a carboxylic acid by Benedict’s solution due to the presence of an aldehyde group and an adjacent hydroxyl group?

A reducing sugar

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14

Sugar acids are named by replacing the -ose ending of the monosaccharide with _________.

-onic acid

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15

Glucose + Glucose = ?

maltose + H2O

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16

Glucose + Galactose = ?

lactose + H2O

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17

Glucose + Fructose = ?

sucrose + H2O

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18

Lactose is a disaccharide of…

β-D-galactose and α- or β-D-glucose.

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19

Sucrose has an _____________ bond between carbon 1 of glucose and carbon 2 of fructose.

α,β-(—> 2)-glycosidic

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20

Carboxylic acids are ____ acids.

weak

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21

When water is added to a carboxylic acid, what is formed?

carboxylate ions (O- charge) and hydronium ions (H3O+)

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22

________________ are a product of the neutralization of carboxylic acids with a strong base such as NaOH or KOH.

Carboxylate salts

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23

The carboxylate ion is named by replacing the “-ic acid” ending with

“-ate”

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24

What is the reaction between a carboxylic acid and an alcohol in the presence of an acid catalyst and heat to form an ester?

Esterification

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25

When a carboxylic acid and an alcohol are combined in the presence of heat and an acid catalyst, what is the product?

an ester

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26

In acid hydrolysis, an ester reacts with water to produce what?

a carboxylic acid and an alcohol

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27

What is the reaction of an ester with a strong base in the presence of heat that produces a carboxylate salt and an alcohol?

Base hydrolysis (saponification)

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