BharatNotes Hydrocarbon
nounUsage in a UPSC answer
India's pledge to attain net-zero emissions by 2070 hinges on weaning its energy mix off imported hydrocarbons, for an economy that meets over four-fifths of its crude oil demand through imports remains acutely vulnerable to both price shocks and geopolitical coercion.
Synonyms
Antonyms
Word Family
hydrocarbons (n pl), hydrocarbonaceous (adj), hydrocarbon-based (adj)
Root
Greek hydro- = water; -gen = producing; Latin carbō = charcoal; compound coined c. 1800
Etymology
A compound of hydrogen (from Greek hydro-, water + -gen, producing) + carbon (from Latin carbō, charcoal); the term dates from 1800.
Memory Hook
Break it into HYDRO (hydrogen) + CARBON: a hydrocarbon is quite literally just those two elements bonded together, the raw stuff of petrol and coal.
How This Word Works in UPSC Writing
A compound containing carbon and hydrogen only. The reason this single family generates so vast a chemistry is catenation, carbon's capacity to bond to itself in long stable chains and rings, which together with its tetravalency produces millions of distinct compounds from one element. The classification runs on two axes: saturated alkanes with only single bonds against unsaturated alkenes and alkynes with double or triple bonds, and aliphatic open chains against aromatic ring systems built on benzene. The combustion behaviour is worth carrying into everyday reasoning. Complete combustion in sufficient oxygen yields carbon dioxide and water with a clean blue flame, while incomplete combustion yields carbon monoxide and unburnt carbon, giving the yellow sooty flame that signals a poorly ventilated burner, and it is that carbon monoxide which makes charcoal braziers in closed rooms lethal.
Don’t Confuse It With
Saturated hydrocarbons contain only single carbon to carbon bonds, while unsaturated ones contain double or triple bonds and are more reactive, which is why they decolourise bromine water in the standard test. Aliphatic means open-chain or a non-aromatic ring, while aromatic means containing a benzene-type ring. A hydrocarbon contains carbon and hydrogen only, so alcohols, acids and esters are organic compounds but not hydrocarbons. Catenation is carbon's self-linking capacity that makes the entire family possible.
Hindi Meaning
हाइड्रोकार्बन; संतृप्त for saturated and असंतृप्त for unsaturated.
Common Questions
- What is a hydrocarbon?
- An organic compound made up of carbon and hydrogen atoms only, found in petroleum, natural gas and coal.
- Why does incomplete combustion give a yellow sooty flame?
- Because insufficient oxygen leaves unburnt carbon particles that glow yellow, and it also produces carbon monoxide, which is why poor ventilation makes burning fuels dangerous.
Seen in UPSC Question Papers
- Prelims 2019 — Energy Technology
- Prelims 2010 — Ecology
Real UPSC previous-year questions whose text uses “Hydrocarbon” — proof this word earns its place on your list.
Tip: press Alt+S to hear pronunciation
