`R-I+Zn+I-R to R-R+ZnI_2`, The reaction is

In the replacement reaction R3C-I + M-F -> R3C-F + M-I the reaction will be most favourable if M happens to be

If I be the set of integers and if the relation R be defined over I by a R iff a-b is an integer,a,b in I, Then Relation R is

(a). IF both (A) and (R) are correct and (R) is the correct explanation of (A). (b). If both (A) and (R) are correct but (R) is not the correct explanation of (A). (c). If (A) is correct, but (R) is incorrect. (d). If (A) is incorrect, but (R) is correct. ltbr. (e) if both (A) and (R) are incorrect. Q. Assertion (A): IN the reaction i_(2) is a oxidant. 2S_(2)O_(3)^(2-)+I_(2)toS_(4)O_(6)^(2-)+2I^(ɵ) Reason (R): During oxidation loss of electron takes place.

(a). IF both (A) and (R) are correct and (R) is the correct explanation of (A). (b). If both (A) and (R) are correct but (R) is not the correct explanation of (A). (c). If (A) is correct, but (R) is incorrect. (d). If (A) is incorrect, but (R) is correct. ltbr. (e) if both (A) and (R) are incorrect. Q. Assertion (A): Estimation of reducing substance by the use of standard I_(2) is called iodometry. Reason (R): in the reaction I_(2)+S_(2)O_(3)^(2-)toS_(4)O_(6)^(2-)+2I^(ɵ) The n factor of S_(2)O_(3)^(2-) is one.

(a). IF both (A) and (R) are correct and (R) is the correct explanation of (A). (b). If both (A) and (R) are correct but (R) is not the correct explanation of (A). (c). If (A) is correct, but (R) is incorrect. (d). If (A) is incorrect, but (R) is correct. ltbr. (e) if both (A) and (R) are incorrect. Q. Assertion (A): Estimation of reducing substance by the use of standard I_(2) is called iodometry. Reason (R): in the reaction I_(2)+S_(2)O_(3)^(2-)toS_(4)O_(6)^(2-)+2I^(ɵ) The n factor of S_(2)O_(3)^(2-) is one.

Let f(x)=(r-2)(r+1)x^(2)+r(r-2)x-r(r-2)=0, where r in I,x in R. If roots of the equation f(x_(i)) are real and sum_(i=1)^(3)(f(x_(i)))^(2)=0, then the value of r is

Why R-I is more reactive than R-Cl in substitute reaction ( S_N2 method ) ?