Class 12 > PYQ CHEMISTRY > 2020 > Set 2

2020

History 2 Views

Q1
The substitution reaction of alkyl halide mainly occurs by Sɴ1 or Sɴ2 mechanism. Whatever mechanism alkyl halides follow for the substitution reaction to occur, the polarity of the carbon halogen bond is responsible for these substitution reactions. The rate of Sɴ1 reactions are governed by the stability of carbocation whereas for Sɴ2 reactions steric factor is the deciding factor. If the starting material is a chiral compound, we may end up with an inverted product or racemic mixture depending upon the type of mechanism followed by alkyl halide. Cleavage of ethers with HI is also governed by steric factor and stability of carbocation, which indicates that in organic chemistry, these two major factors help us i

Q2
Which structural unit present in a detergent makes it non-biodegradable?

Q4
Identify which liquid will have a higher vapour pressure at 90°C if the boiling points of two liquids A and B are 140°C and 180°C, respectively.

Q5
Will the rate constant of the reaction depend upon T if the Eact (activation energy) of the reaction is zero ?

Q6
Out of zinc and tin, whose coating is better to protect iron objects ?

2
3
4