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Haloalkanes and Haloarenes

Short Answer Type

181. How would you bring about the following conversions?
Propene to 2-bromopropane.

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182.

What happens when:
2-Bromopropane is treated with HI in the presence of red P?

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183.

What happens when:
2-Bromopropane is treated with H₂, in the presence of Ni catalyst?

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184.

What happens when:
2-Bromoprane is treated with silver cyanide?

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185.

What happens when:
2-Bromopropane is treated with ammonia?

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186.

What happens when:
1-Bromopropane reacts with metallic sodium?

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187.

What happens when:
Iodoethane is heated with alcoholic potassium hydroxide?

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188.

What happens when:
Iodomethane is treated with ammonia?

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189.

What happens when:
Bromoethane is treated with caustic potash?

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190.
Haloalkanes react with KCN to form alkyl cyanides as main product while AgCN form isocyanides as the chief product. Give reason.

KCN is predominantly ionic and provides cyanide ions in solution. Although both carbon and nitrogen atoms are in a position to donate electron pairs, the attack takes place mainly through carbon atom and not through nitrogen atom since C—C bond is more stable than C—N bond. However, AgCN is mainly covalent in nature and nitrogen is free to donate electron pair forming isocyanide as the main product.

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