Haloalkanes And Haloarenes

Step 1: Understanding the hydrolysis of sucrose.
- Sucrose is dextrorotatory ( ), meaning it rotates plane-polarized light to the right.
- Upon hydrolysis, it yields glucose and fructose.
Step 2: Identifying the optical rotation of products.
- Glucose is dextrorotatory ( ).
- Fructose is laevorotatory ( ).
Step 3: Determining the optical rotation of the mixture.
- Since fructose has a higher magnitude of rotation than glucose, the mixture is net laevorotatory.
- Hence, statements (iii) and (iv) are correct.

Step 1: Understanding the properties of phosphorus allotropes.
- White phosphorus is highly reactive and catches fire in air.
- Red phosphorus is more stable but can still burn in air under sufficient heating.
Step 2: Identifying the common property.
- White and red phosphorus both burn when heated in air, making option (A) correct.

Step 1: Understanding the bonding in .
- Xenon has an expanded octet and forms four bonds with oxygen.
- Each oxygen atom forms a bond with xenon.
Step 2: Confirming the correct answer.
- The molecule is tetrahedral with four bonds.

Step 1: Understanding bond structure in allyl cyanide.
- Allyl cyanide ( ) consists of:
1. A C=C double bond (1 sigma, 1 pi bond).
2. A C≡N triple bond (1 sigma, 2 pi bonds).
3. Single bonds (C-H, C-C, C-N) contributing sigma bonds.
Step 2: Counting bonds and lone pairs.
- Sigma bonds: 9.
- Pi bonds: 3 (1 from C=C and 2 from C≡N).
- Lone pairs: One on nitrogen.