Science (English Medium) Class 12 - CBSE Important Questions for Chemistry

Complete the following reactions:

Name the reagents used in the following reactions:

Why are alkyl halides insoluble in water?

How do you convert the following :

 Ethyne to Ethanal

Write the equations involved in the following reactions :

Stephen reaction

Predict the products of the following reactions :

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: 

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

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