Чей, Какой, Который: Whose, What Kind, Which

After кто and что (which ask for a whole missing noun), Russian has a second layer of question words that ask about a noun's owner, quality, or identity within a set. These are the adjectival interrogatives — чей ("whose"), како́й ("what kind / which"), and кото́рый ("which one") — and the defining fact about all three is that they agree with the noun they question, declining like adjectives in gender, number and case. The contrast English speakers most often blur is како́й vs кото́рый: како́й asks about quality or type ("what sort of car?"), while кото́рый selects from a known set ("which of these cars?") and also serves as the workhorse relative pronoun ("the man who…").

Чей: "whose" — agrees with the thing owned

чей asks about possession. Its endings are slightly irregular (a soft, fleeting-vowel stem: чей → чь-), but the crucial conceptual point is that чей agrees with the possessed object, not with the owner. "Whose book?" is Чья кни́га? — feminine, because кни́га is feminine — regardless of who owns it.

* Accusative copies the nominative (inanimate) or genitive (animate) — the animacy rule.

Какой: "what kind / which / what a…!"

како́й (кака́я / како́е / каки́е) declines as a regular hard adjective and is enormously versatile. Its core sense is "what kind of / what sort of," asking about the quality or character of a thing. By extension it also asks "which?" in a loose, open-ended way, and — with no question intonation — it becomes the exclamatory "what a…!"

• Quality: Како́й он челове́к? ("What kind of person is he?").
• Loose "which": В како́м го́роде ты живёшь? ("Which / what city do you live in?").
• Exclamation: Кака́я краси́вая пого́да! ("What lovely weather!").

Like any adjective, како́й takes the case its noun is in: На како́й авто́бус ты ждёшь? ("Which bus are you waiting for?" — here на + accusative), В каки́х города́х ты был? ("Which cities have you been to?" — prepositional plural).

Который: "which one (of a set)" and the relative pronoun

кото́рый also declines as a regular hard adjective, but its meaning is selective — it picks one item out of a known, limited set. "Which of these two?" is Кото́рый из двух? The most frequent fixed use is telling time: Кото́рый час? ("What time is it?", literally "which hour?").

But кото́рый earns its keep as the main relative pronoun of Russian — "who / which / that" introducing a relative clause. It agrees in gender and number with the noun it refers back to (the antecedent), but takes its case from its role inside the relative clause:

Какой vs Который: the core contrast

This is the distinction to lock in. како́й asks about quality / type — what sort of thing, an open description. кото́рый asks you to select one from a defined set — which specific one of the options in front of us.

• Како́й тебе́ нра́вится цвет? — "What colour do you like?" (open: any colour in the world).
• Кото́рый из э́тих цвето́в тебе́ нра́вится? — "Which of these colours do you like?" (closed set: the ones shown).

In everyday speech, како́й often encroaches on кото́рый's "which" territory (Како́й из них…? is widely heard), but the reverse does not happen: кото́рый never means "what kind of." And only кото́рый works as the relative pronoun in neutral prose.

How this differs from English

English uses three short, invariable words — whose, what (kind of), which — and never changes their form. Russian makes all three agree with the noun, so you must track gender, number and case on the question word itself. Two specific traps for English speakers: (1) English "whose" agrees with nothing, so learners forget that чей must match the possessed noun (Чья кни́га?, not Чей кни́га?). (2) English collapses "which" and "what kind" into one fuzzy *which/what, while Russian forces the type vs selection choice between како́й and кото́рый. And where English can drop the relative pronoun entirely ("the book you gave me"), Russian cannot — кото́рый must be present and correctly inflected (кни́га, кото́рую ты дал).

Common Mistakes

Key Takeaways

• All three are adjectival: they agree with their noun in gender, number and case and decline like adjectives.
• чей ("whose") agrees with the thing possessed, not the owner: Чья кни́га?, Чьи перча́тки?
• како́й ("what kind / what a…!") asks about quality or type, and is the exclamatory "what a…!" (Како́й краси́вый дом!).
• кото́рый ("which one") selects from a known set (Кото́рый час?) and is the main relative pronoun (челове́к, кото́рый…).
• Relative кото́рый: gender + number from the antecedent, case from its role inside the relative clause — and it can never be dropped, unlike English "that/who."
• Core contrast: како́й = quality/type; кото́рый = selection from a set (and the neutral relative pronoun).