Which one of the following alkenes will react faster with H2 under catalytic hydrogenation conditions?(R=Alkyl substituent)
Which one of the following alkenes will react faster with H2 under catalytic hydrogenation conditions?(R=Alkyl substituent)
The Correct Option is A
Solution and Explanation
Alkene stability is negatively correlated with alkene hydrogenation heat.
In the third compound, hydrogenation is catalytically accomplished. In the third compound more than any other compound, less energy is needed to break the double bond.
The alkene is more stable the more alkyl groups there are connected to the doubly bound carbon atoms. (Less aggressive)
Top Questions on Hydrocarbons
- What is the molecular formula of alkane?
- TS POLYCET - 2025
- Chemistry
- Hydrocarbons
- Double bond is present in:
- TS POLYCET - 2025
- Chemistry
- Hydrocarbons
- Which of the following is a mild base?
- TS POLYCET - 2025
- Chemistry
- Hydrocarbons
- The below reaction is an example of: \[ \text{CH}_3\text{C} \equiv \text{C}\text{CH}_3 \xrightarrow{\text{Ni catalyst, H}_2} \text{CH}_3\text{CH}_2\text{CH}_2\text{CH}_3 \quad (\text{n-Butane}) \]
- TS POLYCET - 2025
- Chemistry
- Hydrocarbons
- Which of the following is an example of an alkene?
- MHT CET - 2025
- Chemistry
- Hydrocarbons
Questions Asked in NEET exam
- A wire of resistance \(R\) is cut into 8 equal pieces. From these pieces, two equivalent resistances are made by adding four of these together in parallel. Then these two are added in series. The net effective resistance of the combination is:
- NEET (UG) - 2025
- Resistance
- An oxygen cylinder of volume 30 litre has 18.20 moles of oxygen. After some oxygen is withdrawn from the cylinder, its gauge pressure drops to 11 atmospheric pressure at temperature \(27^\circ\)C. The mass of the oxygen withdrawn from the cylinder is nearly equal to: [Given, \(R = \frac{100}{12} \text{ J mol}^{-1} \text{K}^{-1}\), and molecular mass of \(O_2 = 32 \text{ g/mol}\), 1 atm pressure = \(1.01 \times 10^5 \text{ N/m}^2\)]
- NEET (UG) - 2025
- Ideal-gas equation and absolute temperature
- Given below are two statements:
Statement I: Fig fruit is a non-vegetarian fruit as it has enclosed fig wasps in it.
Statement II: Fig wasp and fig tree exhibit a mutual relationship as the fig wasp completes its life cycle in the fig fruit and the fig fruit gets pollinated by the fig wasp. The current passing through the battery in the given circuit, is:
- NEET (UG) - 2025
- Current electricity
Three identical heat conducting rods are connected in series as shown in the figure. The rods on the sides have thermal conductivity 2K while that in the middle has thermal conductivity K. The left end of the combination is maintained at temperature 3T and the right end at T. The rods are thermally insulated from outside. In steady state, temperature at the left junction is \(T_1\) and that at the right junction is \(T_2\). The ratio \(T_1 / T_2\) is
- NEET (UG) - 2025
- Conductivity-thermal and electrical
Concepts Used:
Alkenes
Alkenes
In organic chemistry, an alkene is a hydrocarbon containing a carbon-carbon double bond.[1]
Alkene is often used as synonym of olefin, that is, any hydrocarbon containing one or more double bonds.
Read More: Ozonolysis
IUPAC Nomenclature of Alkenes
- An alkene or cycloalkene is indicated by the suffix (ending) ene.
- For the root name, the longest chain must include both carbon atoms of the double bond.
- The root chain must be numbered beginning at the end closest to a double bond carbon atom. If the double bond is in the chain's centre, the nearest substituent rule is used to determine where the numbering begins.
- If the compound contains more than one double bond, it is named with a diene, triene, or equivalent prefix indicating the number of double bonds, and each double bond is assigned a locator number.
Read More: Unsaturated Hydrocarbon