1) Which of the folll react wid PCl5 ? (multi options correct)
Acetaldehyde
formaldehyde
acetone
ethylalcohol
single option correct
2)The smallest aldose able to form a cyclic hemiacetal is ?
triose wid 3 carbons
pentose wid 5 carbons
tetrose wid 4 carbons and an oxygen atom to form a five membered ring
none
3)Which of the following cannot undergo self claisen condensation ?
CH3CH2CH2CO2C2H5
PhCO2C2H5
PhCO2Ph
4)Formic acid and acetic acid can be distinguished by using (multi options correct)
conc H2SO4
Tollens Reagent
Fehlings Sol
Sodiumsalt on heating
5) What is the difference between Anomers and Epimers ?
6)What is the difference between α and β Glycosidic Linkages?
391) Ketones and alcohols...so acetone and ethyl alcohol.
3) Intramolecular Claisen or Dieckmann condensation is favoured when 5 or 6 membered rings can be formed...problem is none of your substrates are diesters. So none of them react this way.
4) Tollens and Fehling's reagents. Formic acid gives those tests as an exception.
Edit : HCOOH also reacts with sulfuric acid to give carbon dioxide.
29Ans 4..
Tollen's ..fehling and H2SO4
Formic acid gives tollen's and fehling's test..that's an exception
and with H2SO4 it forms CO2
39Strangely acetaldehyde and benzaldehyde react with PCl5 to give ethylidene and benzylidene chloride. Ethylidene chloride you will be familiar with...its other name is CHLORAL.
But self claisen can only be done by DIESTERS...your substrates are MONOESTERS!
1PAIR OF CARBOHYDRATES (DIASTEREOMERS) THAT DIFFER AT ONLY 1 ASYMMMETRIC CARBON---->EPIMERS
PAIR OF CARBOHYDRATES (DIASTEREOMERS) THAT DIFFER AT CARBON-1 ---->ANOMERS
