Aldehydes and Ketones

Question 1

Formalin composition

Answer 1

40% formaldehyde 8% methanol 52% water

Question 2

Catalyst used in lab preparation of formaldehyde/formalin

Answer 2

Platinised asbestos or copper or silver catalyst

Question 3

Temperature in lab preparation of formalin

Answer 3

300C

Question 4

Reactants in lab preparation of formalin

Answer 4

methanol & O2

Question 5

Catalyst used in industrial preparation of formaldehyde/formalin

Answer 5

FeO Mo2O3 silver catalyst

Question 6

Industrial catalyst of acetaldehyde preparation

Answer 6

PdCl2 +CuCl2 [cupric chloride] water

Question 7

Preparation of Acetone

Answer 7

Dry distillation of calcium acetate

Question 8

higher mp and bp compared to

Answer 8

alkanes

Question 9

lower mp and bp compared to

Answer 9

alcohol

Question 10

solubility

Answer 10

More soluble than alkanes but less than alcohols

Question 11

sp2 hybridization

Answer 11

carbonyl carbon

Question 12

catalyst used in ozonide reduction

Answer 12

Zn/H2O

Question 13

catalyst in hydration of alkynes

Answer 13

HgSO4 and H2SO4

Question 14

hydration if alkynes results in the formation of intermediate

Answer 14

vinyl alcohol(ethenol)

Question 15

Oxygen atom in carbonyl acts as

Answer 15

nucleophile

Question 16

carbon atom in carbonyl acts as

Answer 16

electrophile

Question 17

maximum reactivity in nucleophilic substitution reaction

Answer 17

Formaldehyde

Question 18

In Fehling’s reagent red colour is due to

Answer 18

Cuprous oxide Cu2O

Question 19

Enolate ion

Answer 19

check google

Question 20

maximum stearic hindrance when

Answer 20

when larger alkyl group is attached to carbonyl carbon

Question 21

Reactivity order

Answer 21

HCHO>RCHO>RCRO

Question 22

Addition of sodium Bisulfate

Answer 22

White ppt

Question 23

Bisulfite regenerates parent ketone

Answer 23

on heating with dilute mineral acid

Question 24

two molecules of an aldehyde are reacted to produce a primary alcohol and a carboxylic acid

Answer 24

Cannizzaro reaction

Question 25

Polymerization catalyst

Answer 25

dilute sulphuric acid

Question 26

Polymerization of formaldehyde

Answer 26

metaformaldehyde

Question 27

polymerization of acetaldehyde

Answer 27

paraldehyde

Question 28

Reaction with hydrazines to form

Answer 28

hydrazones

Question 29

Reaction with hydroxylamine to form

Answer 29

oximes

Question 30

Addition of alcohols with aldehydes with HCl gas

Answer 30

acetals

Question 31

Clemmensen reaction (acidic)

Answer 31

Zn or Hg in hcl reduces the carbonyl to CH2

Question 32

Wolff-Kishner reduction (basic)

Answer 32

NH2NH2/ KOH /ethylene glycol reduces carbonyl to CH2

Question 33

Catalytic reduction

Answer 33

Alcohol formed

Question 34

Catalytic reduction catalysts

Answer 34

Pt Pd Ni

Question 35

Fehlings test

Answer 35

Cupric tartarate

Question 36

Benedicts test

Answer 36

cupric citrate

Question 37

urotropine is mad efrom which aldehyde

Answer 37

formaldehyde

Question 38

Phenolic resins and synthetic drugs

Answer 38

acetaldehyde