CIE Chemistry (US-0439): Specimen Questions with Answers 143 - 144 of 240

Question number: 143

MCQ▾

Question

According to the general formula of hydrocarbons, the formula of Hexene is ________.

Choices

Choice (4) Response

a.

b.

c.

d.

Answer

d.

Explanation

  • In Organic chemistry, compounds are named in accordance with the number of carbon atoms present in that compound.

  • Name of the for the number of carbon atoms + ane (for alkane) or

  • Following prefixes are used in the naming of the organic compounds.

Prefix table in organic chemistry

Prefix Table in Organic Chemistry

Prefix table in organic chemistry

  • From the given formula , Hexene is an alkene. It has the prefix ‘Hex’ and in the above table this prefix stands for 6 carbon atoms. So it has 6 carbon atoms.
  • The general formula of alkene is , where n is the number of carbon atoms.

  • Thus the number of hydrogen atoms in

  • So the formula of the Hexene is given by:

Question number: 144

Short Answer Question▾

Write in Short

In the presence of sulfuric acid, hydrogen peroxide reacts with iodide ions to form iodine and water. This involves the reduction of hydrogen peroxide.

Complete the word equation for the reaction of sulfuric acid with calcium hydroxide. ………………………. ……………………………………………….

Explanation

.