1. Characteristic group of aldehyde is..
2. Aldehydes and ketones have boiling points lower than those of
and high
of..............of comparable masses.
3. Aliphatic aldehydes do not show......... isomerism
4. When calcium acetate is distilled alone, is formed
5. In Rosenmund reduction, benzoyl chloride in boiling xylene is reduced to benzaldehyd
of..........
(Chhatisgarh
6. The reaction of acetyl chloride with diethylcadmium followed by hydrolysis gives
7. When 2-butyne is hydrated with dil. H_SO, in presence of HgSO4, it gives
8. Addition of water to acetylenic compounds is catalysed by
and
9. The structure of the intermediate product formed by the oxidation of toluene with Cr
anhydride, whose hydrolysis gives benzaldehyde is.
10. The characteristic reactions of aldehydes and ketones are. reactions
11. Propanal is............than propanone towards nucleophiles .
12. The reaction of acetaldehyde with HCN followed by acid hydrolysis gives
13. Aldehydes react with alcohols in presence of dry hydrogen chloride to form
14. Acetone on reduction with magnesium amalgam and water gives se
15. Acetophenone hydrazone when heated with KOH in ethylene glycol at 453 K gives...
is known as.....
16. Fehling solution 'A' consists of an aqueous solution of copper sulphate while Fehling
consists of an alkaline solution of.....
Answers
Answer:
1]carbonyl group
2]The polar carbon-to-oxygen double bond causes aldehydes and ketones to have higher boiling points than those of ethers and alkanes of similar molar masses but lower than those of comparable alcohols that engage in intermolecular hydrogen bonding.
3]Aldehyde group is -CHO. Due to the presence of the hydrogen, the aldehyde can only be present at the terminal of the alkyl chain, or else it will become a ketone if placed in between. So, since aldedhydic group can only be placed at either ends of the chain, no position isomerism is observed.
4].When calcium acetate is distilled alone acetone is formed :
Ca(OOCCH
3
)
2
distill
CaCO
3
+CH
3
COCH
3
5]The Rosenmund reduction is a hydrogenation process in which an acyl chloride is selectively reduced to an aldehyde. The reaction was named after Karl Wilhelm Rosenmund who first reported it.
So, benzoyl chloride is reduced to benzaldehyde in presence of Pd−BaSO
4
and H
2
6]2CH3COCl + Cd(CH3)2 -------------------> 2CH3COCH3 + CdCl2
7]CH RAISED TO 3---- CH SQUARE --------- CO ----CH RAISED TO 3 BUTANOIC
8]Addition of water to acetylene compounds is catalysed by Aqueous H2SO4 and HgSO4. When acetylene is treated with 1% HgSO4 and dil H2SO4, vinyl alcohol is obtained which tautomerizes to acetaldehyde
9]C6H5CH [OCOCH3]2
10]The characteristic reaction of aldehydes and ketones is addition across the carbon-oxygen double bond. Because of polarization of the carbonyl bond, the carbon atom of the carbonyl group becomes electron-deficient, acquiring a partial positive charge.
11]Propanone is sterically more hindered than propanal due to presence of alkyl group on both side of carbonyl carbon making them less reactive towards nucleophilic attack as both methyl group have electron releasing tendency due to +I effect.
12]The reaction of acetaldehyde with HCN followed by hydrolysis gives a product which exhibits. Geometrical isomerism. Solution : Lactic acid is formed
13]When aldehydes are treated with two equivalents of a monohydric alcohol in the presence of dry HCl gas, hemiacetals are produced that further react with one more molecule of alcohol to yield acetal
14] Ketones undergo reduction with magnesium amalgam (Mg−Hg) followed by its hydrolysis to yield vicinal diols (having OH groups on adjacent carbon atoms). When acetone undergoes this reaction then the product formed is known as pinacol.
CH
3
−
O
∣∣
C
−CH
3
H
+
→
Mg−Hg
CH
3
−
OH
∣
C
∣
CH
3
−
OH
∣
C
∣
CH
3
−CH
3
15] In Wolff-Kishner reduction carbonyl group of aldehydes and ketones is converted into methylene group. Aldehydes or ketones are heated with hydrazine and KOH or ptoassium tert butoxide in ethylene glycol to forms alkanes.
R−C(O)−R
′
(i)H
2
N−NH
2
,H
2
O
(ii)KOH/ethylene glycol,Δ
R−CH
2
−R
′
+N
2
16] Fehling solution A is a blue aqueous solution of copper(II) sulphate, while Fehling solution B is a clear and colorless solution of aqueous sodium potassium tartarate (also known as Rochelle salt) and a strong alkali (commonly NaOH).
Explanation: MARK AS BRAINLY LIST PLS BRO