Haloalkanes and...

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : SN² reaction of an optically active aryl halide with an aqueous solution of KOH always gives an alcohol with opposite sign of rotation.
Reason : SN² reactions always proceed with inversion of configuration.

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : Exposure of ultraviolet rays to humans causes skin cancer, disorder and disrupts the immune system.
Reason : Carbon tetrachloride is released into air it rises to the atmosphere and depletes the ozone layer.

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : CCl₄ is not a fire extinguisher.
Reason : CCl₄ is insoluble in water.

Read the assertion and reason carefully to mark the correct option out of the options given below:

Assertion: Addition of bromine to trans-2-butene yields meso-2, 3-dibromobutane
Reason: Bromine addition to an alkene is an electrophilic addition.

Read the assertion and reason carefully to mark the correct option out of the options given below:

Assertion: CCl₄ is not a fire extinguisher.
Reason: CCl₄ is insoluble in water.

Read the assertion and reason carefully to mark the correct option out of the options given below:

Assertion: Alkyl halides form alkenes when heated above300^∘C.
Reason: CH₃CH₂I react slowly with strong base when compared to CD₃CH₂I.

Read the assertion and reason carefully to mark the correct option out of the options given below:

Assertion: is less reactivethan towards reactions.
Reason: Tertiary alkyl halides react predominantly by SN1 mechanism.

Read the assertion and reason carefully to mark the correct option out of the options given below:

Assertion: Aryl halides undergo electrophilic substitutions more readily than benzene.
Reason: Aryl halide gives a mixture of o- and p- products.

Read the assertion and reason carefully to mark the correct option out of the options given below:

Assertion: Optically active 2-iodobutane on treatment with NaI in acetone undergoes racemization.
Reason: Repeated Walden inversions on the reactant and its product eventually gives a racemic mixture.