Key Idea Single bond =1σ, Double bond =1σ,1π; Triple bond =1σ and 2π. Alkynes form aromatic compounds when their vapours are passed over red hot copper or iron tubes. 
The number of sigma (σ) bonds present in the product (A) is 21.
NEET UG 2019 — Chemistry Organic Chemistry
In the following reaction, 
the number of sigma( σ ) bonds present in the product A is
Held on 30 Apr 2019 · Verified 9 Jul 2026.
21
9
24
18
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Markovnikov's rule is applicable to:
Which of the following is a reducing sugar?
Match List I with List II: $\begin{array}{|l|l|l|l|}\hline & \text{List - I} & & \text{List - II} \\\hline \text{A}. & \text{Adenosine} & \text{(i)} & \text{Nitrogen base} \\\hline \text{B.} & \text{Adenylic acid} & \text{(ii)} & \text{Nucleotide} \\\hline \text{C.} & \text{Adenine} & \text{(iii)} & \text{Nucleoside} \\\hline \text{D.} & \text{Alanine} & \text{(iv)} & \text{Amino acid} \\\hline\end{array}$ Choose the option with all correct matches.
Predict the major product ' P ' in the following sequence of reactions- 
Match List-I with List-II $\begin{array}{|l|l|l|l|}\hline & \text{List-I (Mixture)} & & \text{List-II (Method of Separation)} \\\hline A. & \mathrm{CHCl}_3+\mathrm{C}_6 \mathrm{H}_5 \mathrm{NH}_2 & I. & \text{Distillation under reduced pressure} \\\hline B. & \text{Crude oil in petroleum industry} & II. & \text{Steam distillation} \\\hline C. & \text{Glycerol from spent-lye} & III. & \text{Fractional distillation} \\\hline D. & \text{Aniline-water} & IV. & \text{Simple distillation} \\\hline\end{array}$ Choose the correct answer from the options given below :-
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