Directions: In the following question, a number sequence is given with one term missing. Choose the correct term that will continue the same pattern and replace the question mark in the given sequence.
Correct answer: A. 21/43
- A. 21/43
- B. 43/21
- C. 17/35
- D. 20/41
Explanation
The correct answer is 21/43. To find this, observe the patterns separately in numerators and denominators:Numerators:1, 3, 6, 10, 15 - These form a sequence where each term is derived by adding an increasing integer: +2, +3, +4, +5. Therefore, the next difference is +6, leading to 21.Denominators:3, 7, 13, 21, 31 - These numbers have differences of +4, +6, +8, +10, which increase by 2. The next difference is +12, leading to 43.Thus, the next fraction in the sequence is 21/43. Other options do not fit the pattern of triangular numbers or the increasing differences in denominators.
Last updated
About Alkyl Halides
Alkyl halides are named and related to their carbon-halogen structure, polarity and reactivity. The key reactions are nucleophilic substitution by SN1 and SN2 mechanisms and elimination by E1 and E2 mechanisms, including how substrate structure, nucleophile, base, solvent and temperature influence substitution versus elimination.
Practise Alkyl Halides
458 free Alkyl Halides MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemistry questions like this
Chemistry is on 12 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
1-Chloropropane and 2-Chloropropane are _.
𝑂𝐻− + 𝐶2𝐻5 − 𝐼 ⟶ 𝐶2𝐻5 − 𝑂𝐻 + 𝐼− One of the species in the above reaction is a substrate. It is:
2-Chloro-2-methylpropane is an example of:
2-Chlorobutane belongs to:
A compound X (C4H9Br) undergoes the following reactions: C4H9Br NaOH(aq)/heat > C4H10O Cr2O7(2-), H+(aq)/ heat> C4H8O. What is X?