Haloalkanes and Haloarenes

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R : In the light of the above statements, choose the most appropriate from the options given below :

1. A is true but R is false
2. Both A and R are true but R is NOT the correct explanation of A
3. A is false but R is true
4. Both A and R are true and R is the correct explanation of A

Alkyl halide is converted into alkyl isocyanide by reaction with

1. KCN
2. NH4CN
3. NaCN
4. AgCN

The correct statement regarding nucleophilic substitution reaction in a chiral alkyl halide is ;

1. Retention occurs in SN1 reaction and inversion occurs in SN2 reaction.
2. Racemisation occurs in SN1 reaction and retention occurs in SN2 reaction.
3. Racemisation occurs in both SN1 and SN2 reactions.
4. Racemisation occurs in SN1 reaction and inversion occurs in SN2 reaction.

Which among the following halide/s will not show SN1 reaction: Choose the most appropriate answer from the options given below :

1. (B) and (C) only
2. (A), (B) and (D) only
3. (B) only
4. (A) and (B) only