Hello Arpita,

The option (2) A and C only :is correct as because;

(A)  This option says; The reaction between NaOH and 1 - chloropentane predominantly follows an SN2 reaction which absolutely correct as the stability degree of SN2 reaction is  - 1°> 2° >3° . And here the carbon is 1° so it is highly stable.

(B)  Here the carbon is 3° , it is very less stable. So, SN2 is not favorable in this condition.

(C) The reaction of 1 - chloropentane occurs at slower rate than 1 - bromopentane;  the leaving ability of Bromine is greater than chlorine.

Hope it helps.

Thank you.