Which of the following reagents will bring about following transformations?

Which of the following reagents would best accomplish the following transformations?

Give names of the reagents to bring about the following transformations : (i) Pentan - 1 - ol to pentanal, (ii) Allyl alcohol to propenal, (iii) But -2- ene to ethanal and (iv) But - 1 - yne to butanone .

The reagent which can best bring about the following transformation is

Indentify the reagents in the following transformations :

Which of the following process will bring about genetic variation?