Question

PLZ ANSWER FST

I.Dimethyl ketone on reduction with LiAlH4 gives---------------
a.N-Propyl alcohol b.propan-2-ol c.acetaldehyde
2.Number of alpha hydrogen present in 2-methyl propan-2-ol is------------
a.1 b.4 c.0
3.The reaction of propan-2-ol with anhydrous zinc chloride gives-----------
a.Immediate appearance of turbidity b.slow appearance of turbidity c.no reaction at room temperature
4.-------------- has the highest boiling point.
a.propanal b.propan-1-ol c.Methoxyethane
5.Ethane 1,2-diol on heated with dilute sulphuric acid gives------------
a.Ethanal b.Vinyl alcohol 3.Oxirane​

Answer 1

Answer:

Lithium aluminium hydride, LiAlH4, also abbreviated as LAH, is a reducing agent commonly employed in modern organic synthesis.

* It is a nucleophilic reducing agent, best used to reduce polar multiple bonds like C=O.

* LiAlH4 reagent can reduce aldehydes to primary alcohols, ketones to secondary alcohols, carboxylic acids and esters to primary alcohols, amides and nitriles to amines, epoxides to alcohols and lactones to diols.

* Lithium aluminium hydride, LAH reagent cannot reduce an isolated non-polar multiple bond like C=C. However, the double or triple bonds in conjugation with the polar multiple bonds can be reduced.

* LiAlH4 is a powerful reducing agent compared to sodium borohydride, NaBH4, since the Al-H bond is weaker and thus less stable than B-H bond.

1) Structure of Lithium aluminium hydride

2) Preparation

3) Properties

4) Mechanism of Lithium aluminium hydride - LiAlH4 reduction

5) Applications of LiAlH4 in organic synthesis

Answer 2

Explanation:

• secondary alcohol( acetaldehyde)
• 4
• immediate apperance of turbidity
• c methoxyethane
• vinyl alcohol

hope you got this