Question

Q1. Boron is unable to form BF 6 3- ion. Explain?



Q2. Name the allotrope of carbon, which is thermodynamically most stable and also write its standard enthalpy of formation?



Q3. Write the state of hybridisation carbon in each of the following?

(a) H2C=O (b) HCN



Q4. How many sigma and pi bonds present are present in each of the following?

(a) CCl4 (b) CH2=C=CHCH3





Q5. Write the IUPAC name of CH3COCH2CH2CH2COOH



Q6. Explain bonding in diborane with diagram?



Q7. How silicones are prepared. Write their one use?



Q8. Describe electrophiles and nucleophiles with examples of each?

Answer 1

Answer:

Ans 3 A Sp2

B sp.

Ans 4 A 4sigma

B 8sigma and 2π

Ans 5 5-keto hexanoic acid

Ans 8 electrophile=electron deficient species act as lewis acid.

type

1 Neutral electrophile eg CO2 , SO2,SO3

2 Charged electrophile eg + charged species which have incomplete octate

Neucleophiles

1 electron rich species

2 act as lewis base

eg -charged containing species with complete octate