Aldehydes and ketones will not form crystalline derivatives with
(a) sodium bisulphite
(b) phenyl hydrazine
(c) semicarbazide hydrochloride
(d) dihydrogen sodium phosphate
(d) Dihydrogen sodium phosphate (NaH2PO4) does not react with aldehydes and ketones because NaH2PO4 does not have any lone pair of electron on phosphorus atom, so it cannot act as a nucleophile.
Acetone reacts with iodine to form iodoform in the presence of
(a) Ca (b) NaOH (c) KOH (d) Mg
(b) + +4NaOH + COONa +3NaI +3
Which of the following compounds with molecular formula, C5H10 yields acetone on ozonolysis?
(a) 2-methyl-2-butene (molecular formula C5H10) yields acetone on ozonolysis.
Among acetic acid, phenol and n-hexanol which one of the following compound will react with NaHCO3 solution to give sodium salt and CO2?
(a) Acetic acid
(c) Acetic acid and phenol
(a) CH3COOH + NaHCO3 CH3COONa + H2O + CO2
Acetic acid Sodium
The reagent used for the separation of acetaldehyde from acetophenone is
(1) NaHSO3 (2) C6H5NHNH2 (3) NH2OH (4) NaOH and I2
(1) NaHSO3 gives the addition reaction with aldehyde and only aliphatic ketone. Acetophenone is the aromatic ketone so it does not give the addition product with NaHSO3 aldehyde from the addition product with NaHSO3 which on treatment with acid or base give again aldehyde.
Iodoform test is not given by
(a) 2-pentanone (b) ethanol
(c) ethanal (d) 3-pentanone
(d) The compounds which contain either group or group give positive iodoform test. In 2-pentanone, , and , these groups are present, thus they give iodoform as follows
but due to absence of or group in 3-pentanone, it does not give iodoform.
+ +NaOHNo reaction.
Products of the following reaction
CH3CC.CH2CH3 ... are
(a) CH3CHO + CH3CH2CHO
(b) CH3COOH + CH3COCH3
(c) CH3COOH + HOOC.CH2CH3
(d) CH3COOH + CO2
Which alkene on ozonolysis gives CH3CH2CHO and CH3COCH3?
(a) When O3 reacts with alkene, it forms ozonide, which on reaction with Zn and acid or H2/Ni gives aldehydes and/or ketones. These products helps in locating the position of a double bond as
Which one of the following on oxidation gives a ketone?
(a) primary alcohol (b) secondary alcohol
(c) tertiary alcohol (d) All of these
(b) Ketones can be prepared by the oxidation of secondary alcohols by using oxidising agent such as K2Cr2O7/H2SO4.
+ [O] C=O + H2O
2 alcohol Dimethyl ketone
Consider the following transformations
CH3COOH ABC The molecular formula of C is
Due to haloform reaction, i.e. indicate the presence of a ethyl ketone product iodoform is yellow and has a characteristics odor. presence of
It gives haloform reaction.