Science (English Medium) Class 12 - CBSE Important Questions

Predict the products of the following reactions :

Write the IUPAC name of the follow

\[\begin{array}\ce{\phantom{--..}O}\\\ce{\phantom{--..}||}\\ \ce{CH2=CH-C-CH3}\end{array}\]

What happens when Salicylic acid is treated with (CH₃CO)₂ O/H⁺?

 Predict the main product of the following reaction:\[\begin{array}{c}
\ce{O\phantom{----}O\phantom{-}}\\
\ce{||\phantom{----}||\phantom{-}}\\
\ce{CH3-C-CH2-C-OCH3}
\end{array}\ce{->[(i)NaBH4][(ii)H+]}\]

 Why is alpha (α) hydrogen of carbonyl compounds acidic in nature?

Give a simple chemical test to distinguish between 
 

Write the main product formed when propanal reacts with the following reagents: 
2 moles of 3 CH OH in presence of dry HCl 

Write the main product formed when propanal reacts with the following reagents: 
H₂N- NH₂  followed by heating with KOH in ethylene glycol.

 Arrange the following compounds in increasing order of their property as indicated:
 F - CH₂COOH, O₂N - CH₂ COOH CH₃ COOH,HCOOH - acid character. 

 Acetone, Acetaldehyde, Benzaldehyde, Acetophenone – reactivity towards addition of HCN. 

complete the following reaction: 

complete the following reaction: 

\[\begin{array}{cc}
\phantom{...}\ce{CH3} \\
| \\
\phantom{.................}\ce{CH3-CH-COOH ->[(i) Br2/Red P4][(ii)H2O]}
\end{array}\]

Write a chemical reaction to show that the open structure of D-glucose contains the following : 

 Aldehyde as a carbonyl group 

Give a reason for the following : 
N-N bond is weaker than the P-P bond.

Complete the following reaction:

Complete the following reaction:
\[\ce{(C6H5CH2)2Cd + 2CH3COCI}\]

An alkene ‘A’ (Mol. formula \[\ce{C5H10}\]) on ozonolysis gives a mixture of two compounds ‘B’ and ‘C’. Compound ‘B’ gives positive Fehling’s test and also forms iodoform on treatment with \[\ce{I2}\] and \[\ce{NaOH}\]. Compound ‘C’ does not give Fehling’s test but forms iodoform. Identify the compounds A, B and C. Write the reaction for ozonolysis and formation of iodoform from B and C.

Arrange the following in the increasing order of their property indicated:

Acetaldehyde, Acetone, Methyl tert butyl ketone (reactivity towards NH₂OH).

Give reasons to support the answer:

Presence of Alpha hydrogen in aldehydes and ketones is essential for aldol condensation.

Write the IUPAC name for the following organic compound: