L1 - P block and organometallic synthesis

Question 1

General formula of a phosphine

Answer 1

PR3

Question 2

General formula of a phosphite

Answer 2

P(OR)3

Question 3

General formula of a phosphonium

Answer 3

PR4+

Question 4

General formula of a phosphonate

Answer 4

OP(OR)2R

Question 5

General formula of a phosphate

Answer 5

OP(OR)3

Question 6

General formula of a phosphine oxide

Answer 6

OPR3

Question 7

How is phosphorus as a nucleophile?

Answer 7

It is a good nucleophile but not a good base due to the lone pair on P atom

Question 8

How does P compare to N in terms of electronegativity and nucleophilicity?

Answer 8

More electropositive compared to N (N=3.04, P=2.19 electronegativities) therefore it donates electrons easier and is more nucleophilic compared to N

Question 9

What is the oxidation of phosphorus like?

Answer 9

P likes to be oxidised as P-O and P=O are strong bonds

Question 10

How does the Sn2 reaction on P proceed?

Answer 10

Via a pentavalent intermediate

Question 11

How is phosphorus as a leaving group?

Answer 11

It is a good leaving group with a low pKaH

Question 12

What is the bond energy of P-O?

Answer 12

335 kJmol-1

Question 13

What is the bond energy of P=O?

Answer 13

544 kJmol-1