Multiple Choice QuestionsIn the following sequence of reactions,
the end product is (C) is
acetone
methane
acetaldehyde
acetaldehyde
D.
acetaldehyde
Which one of the following sets of monosaccharides forms sucrose?
B.
α-D-glucopyranose and β-D-fructofuranoseSucrose is composed of α-D-glucopyranose and β-D-fructofuranose units which are joined by α, β-glycosidic linkage between C-1 of the glucose unit and C-2 of the fructose unit.
Which of the following statements is false?
Artificial silk is derved from cellulose
Nylon-66 is an example of elastomer
The repeat unit in natural rubber isoprene
The repeat unit in natural rubber isoprene
B.
Nylon-66 is an example of elastomer
Nylon-66 is a fibre as in it the forces of attraction are H-bonding. All other given statement are true.
The correct order of decreasing acid strength of trichloroacetic acid (A), trifluoroacetic acid (B), acetic acid (C) and formic acid (D) is
B > A> D > C
B > D > C > A
A> B > C > D
A> B > C > D
A.
B > A> D > C
If an electron withdrawing group (-I showing group) is present, it makes the removal of proton more easy by stabilising the remaining carboxylate ion and thus, makes the acid more acidic. The order of acidity of given compounds is
Predict the products in the given reaction,
C.
When benzaldehyde is treated with 50% alkali, it undergoes oxidation to give an acid salt as well as a reduction to give an alcohol. This reaction is called Cannizzaro's reaction.
CH3CHO and C6H5CH2CHO can be distinguished chemically by
Benedict test
Iodoform test
Tollen's reagent test
Tollen's reagent test
B.
Iodoform test
CH3CHO and C6H5CH2CHO both being aliphatic aldehydes react with Tollen's reagent, Fehling solution and Benedict solution. So, these reagents cannot be used to distinguish them. CH3CHOreacts with NaOH and I2 to give yellow crystals of iodoform while C6H5CH2CHO does not react with it.
CH3CHO +3I2 4 NaOH → CHI3 +HCOONa +3NaI +3H2O
C6H5CH2CHO +I2 +4NaOH → No reaction
Thus, CH3CHO and C6H5CH2CHO can be distinguished by iodoform test.
Acetone is treated with an excess of ethanol in the presence of hydrochloric acid. The product obtained is.
D.
When carbonyl compounds are treated with alcohol, they form hemiacetal (hemiketal and acetal/ketal.)
Among the following compounds, the one that is most reactive towards electrophilic nitration is
Benzoic acid
Nitrobenzene
toluene
toluene
C.
toluene
The presence of electron releasing group like -R, -OH etc., increases the electron density at o/p position and thus, makes the benzene ring more reactive (at(o/p position) towards electrophile. On the other hand, electron withdrawing group like-COOH,-NO2 etc. If present, reduces electron density and thus, reduces the activity benzene nucleus towards electrophile.Thus, the order of the given compounds towards electrophilic nitration is
Thus, toluene is most reactive towards electrophilic nitration.
Which of the following is not condensation polymer?
Melamine
Glyptal
Dacron
Dacron
D.
Dacron
Condensation polymers are obtained by bifunctional molecules (monomers) with the elimination of smaller molecules whereas additional polymers are obtained from multiple bonds containing monomers. Neoprene is a polymer of chloroprene (CH2 =C(Cl)-C=CH2) so it is an addition polymer, not a condensation polymer.
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