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Asked in Premeth Test 13 — Aldehydes and Ketones

If - means *, * means +, + means / and / means -, then 40 * 12 + 3 - 6 / 60 = ?

Correct answer: D. 4

  • A. 1
  • B. 2
  • C. 3
  • D. 4
  • E. None of the above

Explanation

First, substitute the symbols in the expression as follows:- means *, * means +, + means /, and / means -.This transforms the given expression 40 * 12 + 3 - 6 / 60 into 40 + 12 / 3 * 6 - 60.Now, follow the order of operations (BODMAS/BIDMAS):40 + 12 / 3 * 6 - 6040 + (12 / 3) * 6 - 6040 + 4 * 6 - 6040 + 24 - 6064 - 60= 4Therefore, the correct answer is Option D: 4. Other options are incorrect as they do not match the calculated result.

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About Aldehydes and Ketones

Aldehydes and ketones contain the polar carbonyl group, but aldehydes are generally more readily oxidised and more reactive than ketones. Coverage includes preparation by oxidation or reduction routes, nucleophilic addition of reagents such as hydrogen cyanide and bisulfite, and tests that distinguish aldehydes from ketones.

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